My Verizon sold N7 actually works with my T-Mobile unlimited PHONE sim. I only do that at home since I don't have a case for it yet, but I have sms through xposed, the T-Mobile visual voicemail, and Vonage for outgoing calls. Tethering also only shows as data used, not tethering. I've done this many times with no issues.
T-Mobile Note 2, unlocked AT&T Note 8, LTE Nexus 7