Q: My iphone 4 is not displaying anything but it is on.

I'm not sure I understand what you're saying.  How can you say others can call or text you when you don't hear or see anything???   In what way in the phone "on"?

Did you try resetting the phone (press both the home and on/off buttons for at least 10 seconds until the Apple logo appears)?

You're welcome.

It was "frozen."

Hi,

Thank you my phone worked too. Could you please also temme why if froze, like it has happened to me second time?

is this a manufacturing fault.

Who knows since you didn't even give any info such as your phone model, iOS version, what you're doing when it froze or how often.  Most of the time it's due to hacked/jailbroken software.

Hi,

I have an iphone 4 16gb

IOS Version: 5.1.1 (9B206)

Model: MC603B

I never even try to jail break it.

it has happened 2nd time to it on 24/05/2012, this time i applied you way.

Earlier it froze around  06/01/2012, this time when my friend fixed it, i am not sure what he did.

Had the same problem today and this worked

Thank you very much...it worked for me too.....:)

Thank you, this still works for the iPhone 5s!!!!