I have 3 cards (Orange and 2 x T-Mobile). When I put either T-Mobile SIM in my phone, it requests a SIM network unlock PIN. I have the option of entering this in or clicking a dismiss button which will take me pass this screen but doesn't register onto the GSM network. This doesn't happen on my Orange SIM as this registers straight away onto the GSM network.
All 3 SIM cards do not request a PIN when I use them with two other phones that I have (HTC Hero and HTC TyTn 2).
On the SGS I have tried the pins 0000, 12345 and 1234 which are default PINs that I recall. I've checked the manual for the SGS and the literature that came with my T-Mobile SIM card and neither give any hints about a default PIN or about a SIM network unlock PIN.
I'm not sure if the PIN request is coming from the phone or the SIM card. I'm guessing it's coming from the phone but I don't know why it doesn't request this when I use my Orange SIM card.
I purchased the phone SIM free. The Orange SIM is a PAYG and the two T-Mobile SIMs are pay monthly contracts. I know all 3 SIMs work without PINs in my other phone.
Can anyone help? I'm assuming I'm missing something really simple but can't figure out what. I've already tried a dozen google searches with no luck. Please please help. I feel I'm being deprived of my 2 hour old SGS phone