Could not activate data connection

I have a new 4s unlocked but when I put my Tmobile chip into the device I get a message like your not subscribed to a mobile data service or could Not activate data connection
There is also no manual APN settings but everything works fine with a vodafone chip

im so releaved i changed my apn settings, i phoned apple twice ,cydia tweaks, i tried several sims in my device, i gave it a system restore, i set it up as a new device.
and in the end i phoned tmobile and it was fixed in amatter of five minutes it turned out after i had activated the micro sim and setup pay and go tethering and my 12 months free web something had gone wrong on there end.
THANKS SO MUCH ANYWAYS GUYS
yes it was unlocked i think tmobile did not add celular data to my account its just odd cause it worked fine and suddenly stopped

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