Someone tell me y i hit *#307# or 306 no function

[ferdinand85]

hi sorry all, can tell me about, i need to ask a question. i follow sidetake guide for downgrade to 1.1.1 , i wanna jailbreak it. but i canot . y? i press *#370# or *#306# also not working? how can i solve the problem?i slide to emergency call and git call for *#370# no working too.. can give me a solution for me ? thanks

[nnnite]

if i remember correctly its *#307# and it only works when u have a sim card in.

[ferdinand85]

to hit tht *#307# need aa simcard to access? which simcard? can tell me? who solve this problem before?>

[nnnite]

any sim card works...you just need to have one in the iphone

[Knolly]

Any sim card regardless of carrier will do the job... It just simply won't do anything without a SIM in the phone.