Security in Android apps


New member
Jul 11, 2015
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I am Conrad, I am new user of this forum, I am from Poland , so please be forgiving on my English.

I'd apologize sorry if I put this topic in incorrect section of forum.
I was wondering, if anybody would hack accounts on Android apps.
I mean for example we are logged on ebay or Facebook app, and we simply quit to home screen, without logging out, and also disconnect from network and again turn on network.

-To the point, Is it technically possible if anybody would hack our sesion, when we logged?
Of course we're using WiFi in home with WPA2, not public hotspot.
-But what if we use card SIM network, is that secure?