Originally Posted by
RichardInSF
It's weird that the service is slow since I believe T-mobile's Japan partner is NTT DoCoMO, which has the biggest network of all. Must be being intentionally throttled.
It is indeed supposed to be throttled to 2G. The odd part is that it seldom seems to be throttled that much. I get 3G in most countries, including Japan, and it will run (seemingly at random) at LTE speeds in many countries.