A:AnswerI am with Verizon and pay $10 a month for my watch to have cellular service. I can leave my phone at home and go out shopping and text and make/receive calls.
A:AnswerIt’s the standard apps like the phone. There isn’t a watch app for everything you do. You can google and find the apps available for the watch.
A:AnswerI have an iPhone 6S, and It works on mine. Make sure there is an iPhone Watch app on your device. As far as the carrier goes, I don’t know because I have AT&T. I would call your local Apple store and ask if it will work with your carrier.