(adsbygoogle = window.adsbygoogle || []).push({}); I have an iPhone 3g on firmware 3.1.3
And want to upgrade to 4.2.1 and jailbreak and unlock.
Where would I start?
My modem firmware is 05.12.01

first find a link to the ofw or youtube it

ok well, im currently updated to firmware ofw 4.2.1 now what do i do?
i just want to unlock the phone, i am willing to jailbreak if i need to
but my main priority is unlocking the phone for tmobile

try this tutorial

all i did was search on youtube how to unlock iphone 3g 4.2.1 tmobile
best of luck man