No Service/Searching iPhone 3GS?

Hi, my iPhone is currently running on the 6.0.1 iOS on the (06.15.00) Basband. I have recently jailbroken my phone in order to use my Vodafone SIM on it (It's currently locked to o2) and I have followed all the instructions to unlock my device. The jailbreak and hacitvation process has worked flawlessly however after download and installing ultrasn0w fixer 6.0.1 then installing ultrasn0w via Cydia, I insert my SIM and all I get is a 'Searching' then a 'No Service' in the top left. I'm running out of ideas any help would be appreciated.

You need jailbreak the carrier too if you wanna need your vodafone sim card working earlier it won't cracked your carrier thats the reason its says No Service/Searching

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