There's a free way to unlock your BlackBerry Bold 9900, simply follow the instructions below.
To unlock your BlackBerry Bold 9900 for free, you will first need to find your Imei Number and Mep ID
(Follow video guide)
Once you have these, you will then need to visit this Unlock Blackberry Free
submit your details and you will receive a free unlock code for your BlackBerry Bold 9900 within 7-10 days, altenatively, you can pay £3.99 to receive your code within a few hours.
I have used this site and it is free, and i got my code within 1 day Clicky
If your in a rush then best take it to the dr