Does anyone have an LTE AppleWatch with an AT&T Grandfathered iPhone UDP? There was talk about the two not being compatible when the watch was released a few months ago. I had to make a few calls to AT&T after I couldn't set my watch up at the Apple Store. They eventually got it to work. Each of my devices has it's own plan (GUDP for the iPhone, $20 UDP with hotspot for the iPad and then the AW). I called AT&T to speak with someone about an unrelated problem earlier. The rep started jumping all over my plans and telling me they shouldn't be set up like that. I'd have to go with one of their new Unlimited Plus or Unlimited Choice data plans even though everything has been working fine. In the end, I told her I'd call back. My original concern wasn't taken care of.