A:AnswerYes. The Apple Watch is a "companion device". It relies on the iPhone to operate at its full potential. An iPhone is required to even set up an Apple Watch to be used.
A:AnswerIt means you can have the watch on a network/ service plan with a carrier such as Sprint or Verizon, and use it as a stand-alone phone; you can make and receive call and sms; also you can check you email if you wish and get directions to the nearest restaurant if your hungry, without actually needing your iPhone!!
A:AnswerEvery series 3 watch is unlock as long as your phone works in the USA the watch will work here as well. If both devices are on WiFi they will also work. Any where your phone works that u have the watch hooked up to will work as it syncs off your phone