Documents Required and Instructions to Register Your Alphanumeric Sender ID in Bangladesh

Before we begin

Due to regulatory requirements, there is sometimes a need for documents to be signed by customers to ensure that registrations are done on behalf of customers that have the right to use the Sender ID. This serves to ensure that traffic is coming from legitimate sources and minimizes any potential misuse.

This article outlines the documentation requirements for a pre-registration in Bangladesh.

Things to note

The instructions below apply to registrations for Alphanumeric Sender IDs by companies based in Bangladesh. If you are not based in Bangladesh, these instructions will not apply to you.


To register your Alphanumeric Sender ID, the Bangladeshi mobile network operators Airtel, Banglalink, Grameenphone, Robi and TeleTalk require that you provide the following information listed below. Citycell does not require this documentation

  • Authorization Letter to Twilio

To get you up and running as quickly as possible, please fill out the documents completely and accurately and provide any other required information. Use the examples provided for guidance. Note that mobile network carriers are very strict about the details! We highly recommend that you download the examples (hit right click, and select 'Save Image As...') and do a side by side comparison when you are filling out the documents.

Provide the Authorization Letter

This letter authorizes Twilio, Inc., to register and send branded SMS messages on your behalf.

Once you have downloaded the form, follow these general instructions: 

  1. Fill in the yellow highlighted fields—completely replace each field with your own information. If a field is not highlighted, don’t change it.
  2. In the matrix, key in, letter for letter, your Sender ID requested.
  3. If you have questions on how to fill in the required fields, refer to the annotated examples we provided for each field. 
  4. Have the documents signed by an authorized signatory of the Sender.
  5. Upload the forms.

Required fields include:

  • Sender company’s letterhead
  • Alphanumeric Sender ID requested
  • Name and Title of authorized signatory
  • Signature of authorized signatory
  • Sender company stamp



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