If you’re using an iPhone, that’s the iMessage/APN protocol, which is not sms (and supposed to be encrypted from T-mobile’s point of view). I would be interested to hear if this indeed is the case. What application are you using?
I use stock Android and use the standard SMS app.
Interesting. It looks like they have already implemented "RCS Universal Profile 1.0" internally: https://www.gsma.com/futurenetworks/wp-content/uploads/2017/07/RCC.71_v1.0.pdf
While it claims to be encrypted using TLS, it also implements a "store and forward" schema, which means the messages are unencrypted while on their data servers, and they could absolutely interfere with what you are doing.
Appreciate the clarity.
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