me also had faced the same problem 1yr. back...
then i went to Nokia care and submitted my phone and they sent it to main office where it got repair.
so i suggest to you just consult with ur nearrest nokia care.
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How To Unlock Nokia N91
1. Type #PW+
2. Enter your unlock code
3. Now type +1#
4. Your Nokia N91 should say “SIM Restriction Off”
Now you should have an unlocked Nokia N91 that you can use with any phone carrier or network.
Just buy a SIM card for that phone carrier and order service. Of course
this phone guide will only work on SIM enabled phones and not CDMA
Improve reception in areas of your home or office where a weak signal is present
with a Nokia N91 Cell Phone Signal Booster. Cell phone signal booster kits for
your Nokia N91 cell phone amplify your wireless provider's frequency. Never miss
a call and get rid of dead zones.