Galaxy S2 (Telus) used this frequency GSM: 850MHz / 900MHz / 1800MHz / 1900MHz
UMTS: Band I (2100MHz) / Band II (1900MHz) / Band IV (AWS) / Band V (850MHz)
Galaxy S2 (T-mobile) frequency:1900 MHz UMTS/HSPA/HSPA Class 3g/4g , this phone used qualcomm chips, while AT&T and International version used Exynos chip
It might work? Try to contact T- Mobile Customer Service
Hehe. Thanks for your reply. Spoken like somebody who's never called an 800 number in his life! Of course that was my first step and yes I called both Telus and T-Mobile. The calls went like this:
"Hello. My name is John. I am please to be of helping to you today. How 'bout our local team? Did they not cause much humiliation to the enemy at the sporting venue recently? How may I be of disservice?"
And it was all down hill from there.
But thanks anyway.
Yes, it will work. They are essentially the exact same phone. On XDA, the same ROM works for both phones. In fact, my T989 on T-Mobile is using the radio firmware from the Telus T989D. I think the difference is that Telus uses 3G/HSPA+ bands only and does not have Edge/2G, which is not a big deal in most areas.