Is there any problem in upgrading my factory unlocked iphone 4 to ios 5...I have found there is problem in sim card verification

i have factory unlocked iphone4 ios 4.3.3 current..I want to upgrade to ios 5 but i have read some forums that there is problem for unofficial carriers
any suggestions please

Hey I had that issue when I tried upgrading my phone.  After I got to the sim card verification page it said that your sim is not valid please insert a valid sim card.  I took it to the Apple Store, where they were able to determine that because I had previously received a replacement phone, the Serial Number was not entered correctly and my phone was actually locked to a different network than mine.  They replace the phone and sim card, locking it to my network in store and then I upgraded to iOS 5 right in store.  This time it went smoothly and only took about 10 mins.
Hope this helps!!

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