att htc titan unlocked wont connect data
 

hi im using att titan unlocked,but im having problems with internet,im on simple mobile unimited plan and its so easy to set up data for simple mobile because apn is just "simple" and there is no other settings and every time after saving apn when i try to go to internet browser trying to connect to this adress :

http://androidapi.t-mobile.com/apppack/mvno.html

i know this is tmobile adress and i know simple mobile running on tmobile network but this is not the first branded unlocked phone which im using on simple mobile and i know im getting 2g im fine with that, can someone point me what to do?i try also to change some settings in native browser but there is nothing there,also every time i boot the phone it ask for unlocking code which i allready did use.. im fine even with this just need help for internet thanks