Intercepting Outgoing SMS

Question

Is it possible to intercept outgoing SMS before it is actually sent, get its contents then ignore / send it according to some criteria?

eg. block all international t

Answer 1

Based on what I've been able to find, it seems as though the answer is either, "It's impossible" or, that it could be possible, but you'd need to write your own SMS app, so that you received the text before it became an SMS, and then you could perform whatever checks you'd like on it before calling the API to actually queue it to be sent.

Sorry =(