Chosen Solution
I have The Iphone 5 that after plugging in charge, it dropped by 1-2 bars 3G (from 4 bars) then dropping to EDGE. Then after I disconnect the plug, the signal goes back up. What is going on? And how can I possibly fix this problem? Thank you.
Pretty sure you need to reset your settings
Try network reset and also try a soft rest with the home & power button. And if that doesn’t work do a update with iTunes.
