No Service after Jailbreak and Unlock ? [Q]

Upgrade from iOS 4.0 to 4.01 and used Jailbreakme and ultrasn0w to jailbreak and unlock my iPhone. Now the Signal bar was drop, then searching…..then No Service.  Try every way still no service.  I know a lot of people get the same problem, does any one fix it and would you please tell
me how to solve it.  My iPhone now becomes a iPod.  (no phone function.)

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