Look Up Phone Numbers with Twilio's Lookup API

Have you ever wanted to retrieve additional information about a phone number? Perhaps you'd like to know whether a number is a land or mobile line. Maybe you'd like to know the caller's name or carrier. If you have a Twilio account, you've got access to an API that gives you access to all of this information and more. In this article, you'll learn how to use TextIt's webhook step to retrieve information about a number within a flow. 


A webhook is an HTTP callback: a POST request that occurs when something happens (a simple event notification). A web application implementing webhooks will POST a message to a URL when something happens, and this is exactly what TextIt does when a contact reaches the 'Call Webhook' step in a flow. We can use this special step to make requests to Twilio's Lookup API. 


First, you'll need a Twilio account. Next, grab the Account SID and Auth Token from its settings page. We'll be plugging these values into the new 'Headers' section of the webhook step. (New to TextIt? Use this guide to connect a Twilio number to your account and start sending). 

Credentials in hand, head over to base64encode.org to apply a special type of encoding that Twilio expects for this sort of request*. Simply input your Account SID and Auth Token separated only by a colon, e.g. ADa19ehc8fb23d2515:d09a32e56d8512685, and click the 'Encode' button. 

*Twilio uses a form of authentication called 'Basic Auth'. Basic Auth requires incoming user credentials to be base64 encoded. 

Copy the output and navigate to your TextIt account. Create a flow, select the 'Call Webhook' RuleSet, click the blue 'Additional Options' link, and create a header whose key is 'Authorization' and value  is 'Basic' plus your encoded Twilio credentials: 

Finally, manipulate to the URL to suit your needs. The expression @contact.tel_e164 will resolve to the active contact's number, but you can change it to another number if necessary. You can also change the 'type' query parameter to be 'caller-name'. 



You'll receive a JSON object like the one above, and you can access any of it's values using the @extra expression. For example, @extra.carrier.type will give you the value of the 'type' key and @extra.carrier.name will give you the name of the carrier. 

If you want your flow to evaluate the contact's carrier's type, you can add a 'Split by Expression' RuleSet like this one: 

The resulting flow might look something like this (landlines are exited): 


  • Twilio does impose a small, pay-as-you-go fee for carrier and caller name lookups, more here
  • You can also pass basic auth credentials through the URL itself, e.g. https://ADa19ehc8fb23d2515:d09a32e56d8512685@lookups.twilio.com/v1/PhoneNumbers/@contact.tel_e164?Type=carrier

Questions? Comments? Let us know! We value your feedback. 

SMS Messaging Best Practices

From research study delivery to customer interaction, SMS messaging has become one of the most effective ways for organizations of every kind to both collect and disseminate information. Use this short guide to ensure that your organization's SMS messaging system adheres to best practices as dictated by the United States telecommunications industry.  

SMS traffic in the United States is governed by the Telephone Consumer Protection Act (TCPA), which dictates how and when enterprises and consumers can exchange messages. If your organization complies with the TCPA, you're probably in good shape, but you may be wondering, "is there anything else I should be considering?"  That bit is dictated by CTIA – The Wireless Association, an advocacy group representing the U.S. wireless communications industry as a whole. This guide serves to break CTIA's messaging recommendations into a short, clear guide to engaging in consumer-oriented messaging while simultaneously preventing the transmission of unwanted messages.

P2P vs A2P

It's important to first distinguish between the US telecommunications industry's person-to-person (P2P) and app-to-person (A2P) messaging definitions. 


P2P covers low-volume messaging, whether the participants are (a) individual wireless consumers or (b) wireless consumers and consumers of cloud-based messaging services or enterprises (e.g. TextIt). These exchanges must conform to the CTIA's "typical human operation" classification, which covers situations in which: 

  • No more than 60 messages are sent per minute. 
  • No more than 1,000 messages are sent per day. 
  • No more than 200 unique recipients are reached in total. 
  • The average ration of incoming to outgoing messages is typically 1:1, with some wiggle room. 

When wireless messaging traffic meets these classification criteria, it is considered to not exhibit the characteristics of unwanted messaging. 


At this time, CTIA views A2P to be all messaging traffic that does not meet its P2P criteria. It's both the type of traffic that the TCPA governs and the subject of this guide. At minimum, A2P traffic should: 

  • Seek the consumer’s express consent to receive informational and/or marketing messages.
  • Give the consumer the ability to revoke consent.

The CTIA sees the following use cases as appropriate for A2P traffic: 

  • Enterprises texting multiple consumers simultaneously. 
  • Call center scenarios 
  • Alerts and notifications 

Best Practices

Send via Short Codes

Short codes are 5 or 6-digit numbers typically reserved for organizations that need to communicate with consumers at a high volume. Use cases include flight delays, banking account alerts, delivery notifications, etc. They're designed to couple higher-volume SMS traffic with built-in consumer protections. As such, you must apply for a short code and go through a review process in order to obtain one. Fortunately, Twilio, our recommended SMS, MMS & IVR channel provider, helps customers through that process

Incorporate Toll-Free Numbers

If you aren't able to obtain a short code, consider toll-free numbers. They're only slightly more expensive than the standard mobile virtual numbers you might purchase from Twilio, but they've got two advantages: 
  • Your contacts don't incur a fee when sending to a toll-free number. 
  • They send 3 messages per second as opposed to standard numbers, which send at a rate of 1 message per second. This cuts down on the time it takes to deliver message broadcasts, and generally improves the speed of two-way interactions.  

Bundle your Numbers

Twilio provides a message service feature called Copilot that enables you to dedicate multiple Twilio numbers to a single TextIt channel, and improve SMS delivery with phone number intelligence features like: 

  • Scaler - distribute messages across a group of phone numbers to reach large audiences in a short amount of time.
  • Geo-Match - create a local experience by automatically using local phone numbers that match country and area codes to your end-user's personal number.
  • Sticky-Sender - send messages with the same recognizable phone number to create a consistent experience and maintain conversation history.
  • Reroute - if you're using a short code, you Twilio will automatically revert to standard long-code phone numbers when a carrier is unable to receive messages from short codes.
With a Twilio messaging service connected to your TextIt account, your messages will be routed intelligently to ensure you're adhering to best practices. Here's a guide to setting that up

What are your thoughts? Let us know. Your feedback is important to us. 

Introducing Outbound Media Support

TextIt now supports outbound media on telephony channels like Twilio, and IP messaging apps like Facebook Messenger and Telegram. This addition rounds out our effort to fully support the exchange of media on our most popular channels, whether incoming or outgoing. 

This week, we're excited to introduce outbound media support. A popular request in recent months, this feature will enable you to add more context to your interactions with images and videos that extend your service's communication potential well beyond 160 characters. 

Getting Started

To add an image or video to a message, simply open up the action editor and click the paperclip icon.

Then, upload your file and continue building! Outbound media actions can be added to both messaging and voice flows. 


  • Outgoing media is displayed in-app for Facebook Messenger, Telegram and Twilio channels, but converted to a link for others. 
  • Twilio only supports MMS in the US and Canada, and will convert a picture message into an SMS with linked media when sending to MMS-incompatible numbers.
  • Twilio will also automatically resize the images you send to meet your contacts' carriers' requirements. 
  • Image attachments are limited to 500KB while video attachments are limited to 20MB. 

Have a use case for outgoing media? Want to request support for a different channel? Let us know! We hope to improve this feature with your feedback. 

Use Facebook Messenger's Checkbox Plugin to Message Website Visitors

Facebook Messenger’s new Checkbox Plugin enables you to authenticate Facebook users with a discrete checkbox that fits naturally into any form. It could be used for just about any form-based use case, but it’s value for TextIt users is collecting opt-ins and contacting website visitors. Once a visitor completes the form, TextIt will message them via Facebook Messenger and add them to your contact list. 

To set it up, navigate to the Triggers page, create a trigger and select the ‘Start a flow when Facebook refers a Contact’ option. In addition to FB Messenger channel and flow, you’ll need to enter a referral id unique to this plugin, e.g. 'textit'. 

Finally, add the plugin to a form on your site. You’ll need to include the optional ref parameter and make sure its value matches the referral id you gave TextIt.

You’re good to go! Any time a visitor clicks your plugin, they’ll receive a message via Facebook Messenger.

Questions? Comments? Let us know. Your feedback is important to us. 

Introducing Nexmo Voice Support

When Nexmo released their new voice API, we jumped at the chance to support it. Nexmo, like Twilio, is a great tool for organizations and developers who want to provide SMS & IVR (voice) communication channels. 

Why Voice?

TextIt’s voice flows allow you to build structured voice interactions that utilize phones' keypads and voice recording functionality. In particular, voice workflows are handy for three reasons:

  • They allow you to send and receive voice messages with improved tone, character and length when compared with text messages.
  • They're synchronous: contacts are actively engaged with your flow for the duration of the call.
  • They enable you to communicate at scale with those who can’t read or write, expanding your organization’s reach.

Use Cases

TextIt’s voice flows can be used to create automated call centers capable of triaging calls and directing clients to the appropriate team member. Alternatively, they're great for outbound communication campaigns: In June of last year, we brought attention to the polio-eradication efforts of UNICEF, the WHO, and the Federal and Provincial Emergency Operation Centers on Polio in Pakistan. In this context, UNICEF's Pakistan Innovations team built voice workflows to disseminate polio knowledge-check surveys designed to equip community leaders with the information they need to affect harmful anti-vaccination discourse and raise awareness within illiterate communities.

Which Service Should I Use?

That’s entirely up to you, as number pricing and availability vary between the two services. First, visit Twilio and Nexmo’s pricing pages to determine whether or not voice-enabled numbers are provided in your country. Learn how to add a voice-enabled Twilio number here

Using Nexmo Voice

The process is simple and painless. First, signup for a Nexmo account and add a voice-enabled number.

Next, login to your TextIt account, navigate to the channels page and select Nexmo. 

If this is the first time you’re connecting a Nexmo account to your TextIt account, you’ll be prompted to enter the API key and secret listed on your Nexmo account’s settings page. Once you’ve connected your accounts, all you need to do is select your number, create a voice flow and start sending.

Questions? Comments? Let us know! We value your feedback. 

Use TextIt to send Emails from your own Address

Sending Email from TextIt

TextIt’s Send Email action is vital to self-service chatbots and standalone messaging workflows alike, as it allows you to notify yourself, your team, or even the active user when a certain condition is met, e.g. a support request is submitted. A chatbot can’t handle every situation, and we don’t believe it should. While they’re great for tedious tasks like registering a user, processing a purchase, checking the weather or booking a flight, a human touch is essential to providing a flexible, reliable and amicable service. After all, more than 8 out of 10 (85%) consumers not only want to be able to receive information but also reply to businesses or engage in a conversation

Using your own Address

By default, TextIt sends emails from no-reply@textit.in. If you’d like to add your own address, simply navigate to your account’s settings page and click the email icon.

Here we’re using a Gmail-hosted email address. You’ll want to plugin your email address, host URL, credentials, port and encryption preference. In the example above, encryption needs to be set to TLS because that’s the protocol Gmail’s SMTP port 587 uses.

Gmail-Specific Considerations

If you want to link a Gmail address to TextIt, you’ll need to switch the ‘Allow less secure apps’ setting in your Gmail account’s ‘Connected apps & sites’ page to ‘ON’:


Note that a standard Gmail account is limited to 500 emails per day. Learn more about Gmail’s limits here:


Questions? Comments? Let us know! ⌨  Your feedback is important to us. 

Customer Spotlight: Learn why BANGS Shoes adopted TextIt

BANGS Shoes is a fashion brand with a unique mission: help people help themselves. Their model is simple, but powerful: sell sleek, classic shoes to fund entrepreneurs around the globe. To date, they’ve invested in 480 entrepreneurs in 58 countries including the USA. We spoke with Hannah Davis, BANGS Shoes’ founder, to learn more about TextIt’s role in their business.


BANGS invests 20% of net profits to help hand-selected entrepreneurs around the world start businesses. Kiva, a nonprofit organization that allows people to lend money via the Internet to low-income entrepreneurs and students in over 80 countries, vets entrepreneurs and handles both loan dissemination and repayment. When a loan is repaid, BANGS re-invests the money in a new entrepreneur. This process increases financial independence, boosts local economies and promotes personal development.

Why TextIt?

Proudly based in Asheville, North Carolina, BANGS Shoes sells exclusively through their website. They use social media and a brand ambassador community to build their brand, which targets adventure-loving, socially-conscious men and women between the ages of 18 and 24.

They initially visited college campuses to build and support their brand ambassador community, but switched to TextIt when it became apparent to Hannah that, in her words, "we needed a way to communicate with our Ambassadors that didn't require a change of behavior." TextIt enables Hannah to send out notifications to her ambassadors, then personally handle each of their responses. It has enabled her to build a personal relationship with each one–something that's very import to her.

Between social media and TextIt, Hannah's approach has paid dividends. BANGS Shoes' ambassador program has grown by 2,000% since 2012.

Interested in learning more about BANGS Shoes? Visit their website or follow bangsshoes on Instagram. Check out their newly-released homage to North Carolina's Blue Ridge Parkway, the Blue Ridge Parkway high top.

Have a question for us? Please, get in touch

Key Mobile Messaging Insights for a Successful 2017

(image source: Dimoco

2016 was a great year for mobile messaging: messaging app usership skyrocketed, smartphone ownership continued to increase around the world thanks to low-cost Android, and chatbots burst onto the scene when Facebook announced Messenger’s bot platform.

In the spirit of reflection, we’d like to share Twilio’s 2016 global mobile messaging consumer report. It's full of great insights even if you don't use Twilio. For those who aren’t familiar, Twilio is by far our most popular integration. It enables organizations around the world to create and deploy SMS or IVR bots in minutes. 

Some key takeaways: 

  • 89% of global consumers want to use messaging to communicate with businesses.
  • The average consumer has 3 messaging apps on their phone’s home screen, uses 3 different messaging apps per week, and sends 3 messages per hour. 
  • 47% of consumers prefer to communicate with businesses via SMS vs. FB Messenger, Whatsapp, Line, Snapchat and others. 
  • More than 8 out of 10 (85%) of consumers not only want to be able to receive information but also reply to businesses or engage in a conversation.
  • Most customers enable notifications for messaging apps (86% in US, 82% in Europe and 77% in Asia, respectively). 

Here’s a link to the full report: 


Questions? Comments? Let us know! ⌨  Your feedback is important to us. 

Introducing the New Flow Results Dashboard

We recently updated the flow results page to display both high and low level information about a particular flow’s performance. 

High-level information is displayed in the top half of the page, as illustrated by the image above. The first graph displays message frequency by day, while the second displays frequency by time. You can use these graphs to evaluate your flow’s performance or plan future broadcasts. 

Beautiful Data

The pie chart on the right of the page displays both the number and percentage of participants who’ve entered and either completed the flow or exited from it, as well as those who exited before completing it. 

Finally, we included a histogram which displays the total number of messages sent and received by date and time throughout your flow's lifespan. 

Getting Granular

The bottom half of the page lists each run. Here, you can view either the value collected by each RuleSet or the full text of the contact’s response at that particular step. Just click the flow icon to toggle between the two values. Additionally, you can add as many columns as you’d like from the 'Add Column' dropdown. 

Exporting Results

Click the ‘Download’ button in the top right corner of the page to export these results to a spreadsheet. You can include up to 10 contact fields, and choose to limit results to only those who responded or each contact’s most recent run. 


Charts will only display for flows with 200 or more responses. The histogram pops up after 1,000.

Questions? Comments? Let us know

Lessons on SMS Survey Design: A Factorial Experiment on SMS Survey Participation using TextIt

Laterite, a Rwanda and Ethiopia-based research and advisory firm, recently used TextIt to implement an SMS survey with agricultural cooperatives in Rwanda. This survey was unique in that it was also used to measure the impact of survey delivery on participation rates. We spoke with Josep Casas and Mallory Baxter of Laterite's research team to learn more about their findings.


Laterite provides data collection and econometric analysis services to government agencies and ministries, international NGOs, think thanks, academic institutions, and development organizations. They conduct the vast majority of their work in countries in which they have an established presence in order to build a strong understanding of the local context.


Using TextIt, Laterite has developed an SMS-surveying solution called conTEXT that is operational on all of Rwanda’s telco networks. It allows the company to send reverse-billed SMS surveys (i.e. at no cost to respondents) as well as airtime incentives on completion of those surveys.

The Experiment

Using conTEXT, Laterite recently conducted an SMS-based survey with members of agricultural cooperatives in Rwanda. They were hired by SPARK International to assess its Cooperative Support Programme (CSP), which targets agricultural cooperatives and SMEs operating in bean, Irish potato, maize and horticulture value chains with an aim to increase food security and stability by accelerating agri-business development, promoting rural economic growth and generating jobs in Rwanda's agricultural sector. The project's budget for interviews was limited, so Laterite and Spark decided to use conTEXT to collect complementary data from cooperative members.

This was the first SMS survey Laterite had carried out in Rwanda, so they wanted to use it to determine the best way to deliver future surveys. The key question was: can small tweaks to SMS survey delivery increase participation, and if so, which? Laterite's research team designed a factorial experiment to explore this question. They tested five factors they thought might impact cooperative members' willingness to participate:

  • Introduction Type: The majority of cooperative members (85%) were introduced to the survey via a phone call while others were introduced to the survey directly via SMS (15%). The call was scripted and focused on potential questions participants might have regarding the content and purpose of the survey.
  • Time of DayHalf of the cooperative members received their surveys in the morning (10 AM) while others received them in the afternoon (4 PM).
  • Personalization: Half of the cooperative members received messages that were personalized (addressed them by name in the introduction using TextIt’s substitution variables) while others received generic messages.

  • Financial Incentive: Half of the cooperative members were informed before the survey that they would receive an incentive of RWF 100 in airtime for completing the survey and received this incentive on survey completion. The other group did not receive any reward.
  • Survey Expiration: Half of the cooperative members were made aware of the fact that the survey would expire after 1 week (as flows can be configured to expire after a period of inactivity) while others were not.

Laterite tested the impact of the phone introduction by randomly allocating 15% of the sample to the SMS Intro group and the rest to the Phone Intro group. Individuals in the phone intro group were called by the enumerator team before the TextIt flow was initiated. Once consent had been obtained following the initial introduction, Laterite implemented a factorial experiment with the remaining factors.

In a factorial experiment, an intervention is broken down into factors and levels, e.g. the factor representing time of day has two levels: morning and afternoon.  In this experiment, Laterite was testing 4 strategies–each with 2 levels–resulting in 16 (2^4) possible experimental conditions. This means that they had to deliver the survey in 16 unique ways. Using a series of “Split by Contact Field” RuleSets, Laterite could create different routes inside the TextIt flow so that each candidate received the messages corresponding with their own combination of factors.

While analysis is on-going, preliminary results suggest that pre-survey phone calls and message personalization had the largest impact on increasing participation rates. Interestingly, financial incentives appear to have had no effect.

Preliminary Results

Introducing the survey via phone call instead of SMS increased the participation rate by 18% while message personalization led to an increase of 8%. Other factors weren't statistically significant. 

Figure 1. The effect of each of the factor on participation rates.


*Green factors were statistically significant while red factors were not

Laterite also tracked the number of errors that occurred for each type of question, allowing them to identify which questions work best. In this case, 'error' is defined as an invalid response as determined by the response rules present in each RuleSet. For example, Laterite included a question that asked participants to reply with their gender and age separated by a plus sign delimiter (e.g. "female+30"). They found that 37% of respondents could not answer the question correctly on the first try while 10% raised an error at least 3 times. Message form questions–as these are called–are unique in that they enable you to collect multiple values in a single message, reducing the number of questions required. To ensure message form error rates are low, you'll want solicit feedback from your contacts and test other value combinations and delimiters (spaces and periods) to determine what works best in your project's context. 

Moving Forward

Laterite’s research team is currently working to understand the links between these factors, survey completion, and attrition between survey rounds. Among their questions is whether a single phone introduction has a lasting effect on participation rates. Laterite is also looking to replicate this experimental design in other contexts to build a body of evidence around the optimal delivery of SMS surveys. 

Questions? Comments? Let us know! Questions for Laterite can be directed to Josep or Mallory, linked above, or its website