Ask :
Sometime home button do not works iphone 4Answer :
Start with the basic steps as needed: Resart, Reset, Restore. See the User Guide. Appendix B.
Reset Home Button Steps:Disscuss This Topic at Apple Forum
(1) Tap Settings App, when open:
(2) Hold Power button until "slide to power off" bar appears.
(3) Don't slide it, release power button.
(4) Gently, continuously press Home button for few seconds until home screen appears.
(5) Done.
If this does not help, further points to Hardware Problem.