Is the reply to this posting suggesting that it is possible to intercept an MMS, provided you implement client side and back end?
“You can’t intercept incoming MMS if you’re thinking to submit the app on the store. You have to implement all your system from scratch(back-end and client-side), like “what’s app messenger”.”
No, it is not suggesting that. It says that you have no access to the MMS sending or receiving functions on iOS, so if you want to send or receive MMS, you will have to do it by relaying the messages via your own server out on the Internet, and it will be completely independent of iOS’s built-in messaging.