Originally Posted by RayTrue04
Preparing sim card is a normal process and always happens at boot. It's part of 4.3 update and it's also present on the HTC One. It just basically preparing your data services. But if it's continuously doing it throughout the day and not just boot up something is not right. Usually the fix would be to reprovision using ##72786# and let it do a hands free activation but you already stated that didn't work so I'm stumped.
Edit: Maybe it's your coverage that's draining your battery. Did you ask the Sprint rep if there was work being done in your area?
Sent from my SPH-L900 using XDA Free mobile app
It was doing it in multiple places (work, gym, home) and they are not all in the same area. Takes about ~15-20 minutes to get to each place from another.
I'm assuming that the process of it constantly saying "Preparing SIM Card" is draining the battery because I don't know what else would drain it. It gets a good signal, at least from the indicator of the signal bars.
This morning, the phone did not show that it had the cellular radio off. I'll leave it unplugged today and see if it drains and see if I observe the Preparing SIM Card loop.