New to jailbreaking.

[J_Clark]

I know there's probably a load of thread's but I'm in a bit of a rush.

My uncle ugraded his contract and passed his iPhone down to me, however I'm on T-mobile and need it unlocking.

I've had a go at trying to jailbreak it myself which didnt work.

I used the pwnage tool, then redsn0w but got stuck on the 'waiting to reboot' screen.

I took it to a phone shop and they said there unable to do it.

I seem to think I've downloaded the wrong firmware or it's my fault I'm doing something wrong.

Heres the phone details.

Version - 4.2.1 (8C148a)

Modem Firmware - 05.15.04

Can anyone help me, I'm going away in the morning and I'd really like to take this..

Thanks

[i.Annie]

You can't unlock it. You can jailbreak it though. Depending on if it is an iPhone 3G or 3GS, you will have a tethered jb if it is a new boot 3GS. If it is an iPhone 3G, you might be able to downgrade the baseband if it has bootloader 5.8 so that you may unlock.

If you really desperately need to unlock and are willing to take any risks, you can upgrade the baseband to 6.15.00 to unlock. You'll need to use Redsn0w 0.9.6rc8 and the 4.2.1 stock ipsw to jailbreak.