I own a OČ Palm Pre and I'm using it with a T-Mobile SIM card. The T-Mobile account is a twin-bill account, so the PIN number of SIM card has five digits to distinguish between the twin bill accounts: 1#### and 2####. #### is the "real" PIN.

Almost every second try after returning from flight-mode the Phone App doesn't accept my PIN, telling me it's wrong. Using the display or the keypad to enter the PIN makes no difference, it's always wrong.

After a reboot the Phone App accepts the PIN perfectly.

Any idea what the problem might be?