Hi

till 2.2 it worked great, after 3.0.0 "NO SERVICE" and remains ...
iPhone 3G 16GB (3.0 04.26.08)
Model : MB500X
Color : White

tried almost all - except downgrading to 2.2.1
(reason current ultrasnow requires 3.0 and 04.26.08)

is there any solution available for this ?

Do you have Wi-Fi and jail broken with Redsn0w 0.8? if you have no wi-fi than look at my recent post about Cyder!

Try with new SIM ( as older SIMS haveing 3vlt and new 5vlts)

if No luck reinstall Untrasn0W ; or google older version and SSH then to Cydia/autoinstall directory and reboot.

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Thanx * Rgds,
Girish Kumar