Bad battery life on iPhone 3GS used as iPod Touch My spouse got an iPhone 4 recently and we want to use the old iPhone 3GS as an iPod for the daughter.  They switched him over at the AT&amp;T store so I don't know if the old phone has a SIM card in it or not right this minute (not at home).

The WIFI works fine.  On the top left of the screen where it would show bars and "AT&amp;T", it displays NO SERVICE.

The issue is this:  the battery drains over night when it is asleep.  I have charged it the last few days and the next time the kid wants it, the battery is dead.  The iphone was only 1 year old so the battery shouldn't be fading.

Is the phone searching for service and draining the battery even when asleep?  

I have disabled the location services and made sure push notifications are set to manual or disabled.  

Any thoughts?  

Thanks in advance.
Remove the SIM. That should solve your problem. It will complain about no SIM whenever it is restarted but apart from that will work fine. I presume you want the WiFi to remain functional.