Question About SMS Format in Telit 4G Modules

Hello,

I would like to ask about the SMS format used in Telit 4G modules when receiving messages:

  1. Does the SMS transmission go through IMS or CS?
  2. If it uses IMS, is the format text/plain?

I would really appreciate any insights on this. Thanks for your help!

Hello,

  1. That would depend on the radio access technology the module is currently attached to, if IMS is enabled and attached, the network and module configuration. In case of 2G/3G the default is CS but it can also be PS. For 4G, it would be either IMS or NAS signaling. If both methods are not supported by the network, CS/PS fallback could be used.
  2. You can switch between text and PDU mode (AT+CMGF) to be used for reading or writing short messages on the application side.

Do you have any particular module type on your mind?

Regards,
Bartłomiej