Nosy Crow Jigsaws was also a responsible example of in-app purchases: parents could buy extra jigsaws via an in-app store, but if you own other Nosy Crow apps, their puzzles are unlocked for free.
However, I came across a post describing how to get your phone unlocked for free via Cingular.
There are a variety of websites that offer unlock codes for free.
If you meet your carrier's requirements, they will typically provide you your unlock code for free.
Usually, if you've been a customer of theirs for some time, they will provide you with an unlock code for free.
If you've had your Nokia phone for a while, the easiest and safest way to unlock it for free is to contact your carrier.
If you've had your phone for a year or more there's a very good chance that your carrier will unlock it for free.
Existing examples: Endless Wordplay, which sells packs of words to practise spelling, or Nosy Crow Jigsaws, which sells puzzles but unlocks them for free if parents own its other apps.
AT&T will unlock your phone for free if you meet the criteria for unlocking.
Your carrier will typically unlock your phone for free after your contract has been fulfilled.
Do not trust sites that claim to unlock phone's for free.
