You can use Alphanumeric Sender ID to send messages to supported countries when using Messaging Services. Twilio will automatically select your Alpha Sender ID when sending to a supported country, unless you have a short code for that country in your pool.
To add an Alpha Sender ID to your Messaging Service, follow these steps: On the Messaging Services Console page, click on the Messaging Service you want to add the Alpha Sender to. Then, add the Alpha Sender ID by clicking the Add Senders button, selecting Alpha Sender from the drop-down, then click Continue and specify the Alpha Sender ID you wish to use.
Alphanumeric Sender IDs can contain up to 11 characters from the following categories:
- Upper-case letters A - Z
- Lower-case letters a - z
- Numbers 0 - 9
Sender IDs must contain at least one letter. Special characters and punctuation are not allowed.
You can find the full list of countries where Alpha Sender ID is supported in the FAQ International support for Alphanumeric Sender ID.