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I was told by the Tmo guy that this phone tethers for free. It's built in anyway, how would they stop you. And unlimited data.
Since the Nexus S is pure Google Android, T-Mobile really has no say in how they manage tethering and etcetera; however, technically tethering is against T-Mobile ToS without specifically purchasing a tethering plan. Still, there's not much they can do. Just try to stay under that 5GB per month data cap so that you can avoid drawing unnecessary attention to your account.
I had read that T-Mobile could somehow scan the packets given off by a phone and tell whether it's using tethered data or not and could charge you that way, but I have yet to get an SMS notification that they know on the Nexus One or Nexus S, so I think that was bunk.
I just noticed I can tether.
I thought I had to pay extra.
Anyone know?


How does T-Mobile prevent people from tethering on other phones? What appears on the screen when someone without a tethering plan attempts to tether?
It's really not that difficult to detect tethering. At lest for unencrypted protocols that send info like a user-agent, like HTTP, T-Mobile can scan to check for a non-Android agent. So you would have to use a tethering app that rewrites the user-agent for those protocols to keep you truly under the radar.
I Think I have the definite answer. I have been tethering everyday as I am staying at a friends house with no internet this month. On Christmas I received a text message from T mobile saying that due to my data usage my data would be throttled for the remainder of my billing cycle in accordance with my contract agreement.
My account says I have used 7+ gb of unlimited data.
I still have unlimited data with no additional charges and I can still tether just fine. It is just REALLY slow, still usable unless I am trying to watch video though.