My iphone 3GS keeps turning off and then back on?

It keeps doing this and it won't stop. I didn't do anything to it. I held the home and lock button for about 15 seconds and that completely turned it off. I then gave my phone a pep talk hoping it would listen and turn on but it didn't.

Do you know what version of ios your phone is running? I've heard that running ios 5 or later can cause problems like that.

Mine is doing the exact same thing!

I had this problem! When you phone reboots, take out the sim card. Then put it back in and turn it on. (sticking a paper clip in the top to release sim) This restarts the network. It won't change anything in you phone settings. Just stops it from doing that.
It worked for me, hope it works for you to!

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