How to stop iphone 3 to keep searching?

It keeps on "searching" after i ended a call and won't go back to the main screen. Also the on/off switch does not work.
How do i fix this?

The home button at the bottom? When buttons go bad, do this.
http://www.imore.com/...tive-touch

As for the ended call just hanging there, I'd try a shut down and restart of the phone to see if it persists. Considering it's a 3 there's probably some lag in the processing speed so a frequent reboot (once a month) wouldn't hurt. Sounds like it's fine for it's age otherwise. Best luck.

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