Sometimes after ending calls in my iphone 4 I find that its screen become completely black and even when i press on Home button this black screen does not disappear unless I do restart to iphone..so any one here can tell me what is the causr of this problem and how can I fix it ?
And u should know that my iphone has ios 4.2.1 and thanks for any help
And u should know that my iphone has ios 4.2.1 and thanks for any help