Re: has anyone successfully unlocked a nokia 521 locked to t- mobile?
You will have needed to spend at least $100 on prepaid access before TMo will unlock it. The thing being, as RumoredNow suggest, it is best to get the carrier to unlock it. The only third parties use someone within TMo OR they pay someone with a TMo account to unlock it. This can take up t a week or more.
Buy a TMo $100 prepaid (non-refundable) then see if they will instantly unlock it. They may make you wait until the $100 has been used, but worth a try. It is pointless asking on the TMo forums as TMo employees there will tell you anything and the TMo unlocking people will tell you something entirely different. Don't ask how I know!!
TMo are improving the cell phone industry in the US, but sadly their CS leaves a GREAT deal to be desired.