Screen does not show the caller ID and un able to answer them

[zaman9595]

hi every one
I do have two problems with my s2 which i bought one week ago,
1- some time (NOT ALWAYS) the screen stay black when some one call, and it doesn''t even activate when i touch it to answer the call.
2- the other problem is that the callers cannot hear my voice clearly
did any one encounter this problem B-4 and how ican solve it , or i have to go back to the dealer?

[RichH]

1 - Could be caused by an app or a bad flash. Was the phone new, what FW version and what is your location?
2 - Could be due to a bad signal or possibly you are using a case on the phone...?