So they just released the Gear S2 3G today on T-Mobile. I got mine and set it up but ran into an issue trying to get it to connect with the cell towers. For whatever reason, likely software related, the device won't activate on the cellular network. I went back to the store and they said it appears to be a known issue affecting all T-Mobile S2 3Gs as they are dealing with numerous customers coming back to the stores reporting the exact same problem. At the moment I don't know if this is just a T-Mobile problem or if this will affect S2 3G watches on AT&T or Verizon. They told me to hold on to the watch and wait for T-Mobile and Samsung to address the issue.