do all nokia phones work with att?

Ya sure all nokia phones will work with AT&T sim only if it is unlocked one else if the nokia phone is locked to some other network provider then it wont accept AT&T sim until you unlock it ...You can easily unlock your phone using sites like Unlock-Zone.com here they are rendering network unlock code for all mobile models at reliable cost .After unlocking the phone you can freely use it with any GSM sim ..