[Problem] Strange message on iPhone

i just got a unlocked 16gb iphone had blackberry with T-Mobile plan 500 anytime unlimited internet and texting put sim in IPhone everything works great> onlything is the enternet works fine when i am in wifi but wheni just want 2 log on out of wifi like at work or somthin it says (could not activate cellular data network: you are not subscribed to a cellular service) :confused: I dont kno what this means i can due it just fine on tha berry can someone plese help me out Thanks.

I believe you need to configure your iPhone to access the Edge/3G.
Try to configure the network: Settings->General->Network
Setup the Cellular Data Network and Data Roaming.

my suggestions to the original poster are
1. turn OFF 3G,
2. add in epc.tmobile.com to the "cellular data network" with no username and no password
3. set Data Roaming ON

some related info here
http://www.hackint0sh.org/forum/f127/33870.htm