Question About SMS Format in Telit 4G Modules

General
1

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!

2

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