When sending SMS to most networks worldwide, you can set your own Sender ID. This may consist of up to 11 alphanumeric characters or be a phone number. Please note that there are some international restrictions regarding sender identification - for example, SMS messages to the USA are always sent from our US phone number.

Theoretically, an alphanumeric sender can also use special characters such as . , : _ - or spaces. However, it is recommended to use only letters in the sender, since a correct dispatch with other characters cannot be guaranteed.

Phone numbers as sender can be transferred in any format. These are automatically recognized and formatted internally.

Only SMS with a phone number as sender can be answered.


  • 004915123456789 - recognized as phone number
  • +4915123456789 - recognized as phone number
  • 0151 - 23456789 - recognized as phone number
  • CompanyABC
  • alarm
  • fire brigade

These senders are invalid

  • ZahnarztpraxisMustermann - Sender is too long (max. 11 characters)
  • Sender$123 - Invalid special characters in sender

Our system automatically replaces invalid or missing sender IDs. If you do not specify a sender, the default sender setting from your account will be used, if any. 

Invalid or missing senders will automatically be replaced by SMS. If you receive SMS messages with the sender SMS, please correct your sender according to the above specifications.

You can, for example, enter the sender directly in the corresponding field in the Webapp or select it from the list of defaults:

Did this answer your question?