My iphone is unlocked, but everytime i put in a sim, the network name comes up with no signal

I bought an unlocked iphone 4 off my friend and tried a few micro sims from different networks and all the networks names come up, but, they all have no bars for signal. Its very frustrating.
Please Help

same problem here!
I have read and spent days for googling it, and there are a lot of people with this problem.
This is more likely to happen if your device is Factory Unlocked.
And it is a pity that i HAVEN'T FOUND ANY SOLUTIONS for this
Haven't met or read anyone with this solved.
mine is originally UK vodafone. it has been factory unlocked and i have gone abroad, restored, and no signal bars,but carrier name appears. But with another foreign SIM card, itHAS GOT signal!! Only with the one i need, is not working.
I hope with a firmware update coming, this will be fixed.
I could link dozens of unanswered questions with the same s**t.
I also noticed, that this problem occured recently ... around November 2011. when iS 5.0 or 5.0.1 came out.

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