On TM it would be. The Iphone doesn't have the 1700 band. That's TM3G. TM is selling the G2, so it does use 1700.
My C6 doesn't have 1700, so it only works on Edge. However wifi is pretty fast and does say 3G. C6 uses 2100 band. Don't know about Iphone.
If the Iphone ever comes to TM, it should work then.