I changed the SIM card on my Samsung Galaxy Ace to another one. Now, whenever I make/receive a call, the screen goes dark and the phone goes unresponsive.
Pressing buttons randomly eventually sets the phone free, but this takes a long time (a few minutes).
I have a rooted Samsung Galaxy Ace running Android 2.3.4 and a stock ROM, and the CPU speed is limited using SetCPU: can this be the cause of the problem?
The problem on this question is similar: Screen goes off as soon I dial or receive a call. CyanogenMod 7.1- stable