Iphone 4 (IOS 6.0.1)  recovering to 3G after no service problem

Hi all,
My Iphone 4 with IOS6.0.1 is having this problem. After my phone go into No service ( When inside lift) and after i come out from lift, the signal recover but it did not recover to 3G / Edge . I need to turn off my phone and on it again ,then it only able to recover to 3G connectivity. I feel it is very unconvinient as i need to turn off the phone and on it again. I did try to turn the flight mode on to reset the network connectivity but it doesn't work. Please help. Thanks

If it is showing invalid SIM error, then the unlocking is not complete. Depending on what carrier authorized the unlock, most require the phone to be restored before the unlock is complete. Once you restore, you should receive a message stating Congratulations, your phnoe is unlocked. Then you restore the  backup of the device from before the unlock restore.

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