Iphone 4 switches off

my iphone 4 switches off when i insert the sim. dont know what to do??

Just want to inform you, that you are not alone. I wish to report the same problem. My brand new iPhone4 can not be switched on in the normal way. I have to press the on/off button and the home button for 10 sec. Phone restarts with the apple logo, than operates normally as long as i keep it awake. When i switch it off, it can be switched on for only 1 min. After 1 min it can not be switched on again, it has to be restarted by pressing the on/off button for 10 sec to restart it from scratch. This must be a serious hardware/software problem. Phone is not usable, I have to return it to the provider (T-Mobil Germany).

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