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An SMS app is just a front-end, a user interface. Actual sending and reception of SMS is handled by the same system service whichever SMS app you use. And I expect the SMSC details are set by your service provider when you insert their SIM - they aren't something you set yourself.
If you want information about your carrier's SMSC a web search will be the simplest way. If you want to change the settings, I've never seen a way.
From all apks in my device"Activation codes" from what?