Yesterday I've been trying to change my messages, contacts and dialler apps in my Lenovo A850+, because stock messages app couldn't recognize number and match it with my contact if there was the country prefix. And additionally the china symbols in that apps were irritating.
I've installed new apps, but it seem that stock apps are still default. So I used root explorer and moved Phone.app, ContactsManager.app and TelephonyProvider.app files to my SD card. Then the ContactsManager were crashing all the time and my SIM card don't work now. I moved that files back to system/apps/ but it didn't help. I made a factory reset and it still don't work... What should I do?
Thanks for help.