Read through this entire thread and am still stuck. Have tried all of the available APN's with NO luck. After I save my settings, the GPRS data icon at the top of the menu appears for a split second, disappears and I immediately get the "internet connection failed" error.

I have the $9.99 data plan--it was working fine on my 5800nav (which is EDGE only) but when I switched the SIM to my N900 I could not get data through t-mobile data. I have even tried fiddling around with my phones on t-mobile.com to see if that would help reset but nothing. Any ideas?