IPhone factory unlock doesn't work

I've an iPhone 4 (sunrise). I contacted sunrise to unlock my iPhone, they confirmed via Email that the iPhone is unlocked. But it doesn't work, I restored the iPhone and put the sim on, but it doesn't work...

I had a similar problem (official unlock did not work) and it was recently resolved with Apple's help.  AT&T approved my unlock nearly 5 months ago and since then we tried repeatedly - using every method suggested here and elsewhere- but we never got the Congrats message and the phone did not work with other SIMs (such as TMobile and SIMS from other countries). 
AT&T wouldn't talk to us because we were no longer customers.  After about 40 restores and 5 months of this headache we gave up. Then one late evening recently I went to the genius bar.  I took all the paperwork, which inlcuded a printout from AT&T's website which showed that the request for unlock had been approved 5 months ago and that we had been restoring in futility since then. After much, much imploration and with Apple's help, my problem was finally solved.
Moral of the story: There are legit instances when an official unlock from AT&T does not go through. The conversation that needs to happen between the phone company and Apple once the unlock is approved sometimes never happens and your phone remains locked despite the approval.  If you find yourself in this situation, do one or both of two things:
put in another request with your phone company (if you can) and try Restoring again
open an AppleCare case. It is worth it at $20.  I was lucky and I didn't have to pay (but I had waited 5 months; your patience may not be that extensive). The service is effective and efficient.

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