A:AnswerNo, it will not hinder calls. You can even have it vibrate on your wrist for calls. It will let you know who is calling as long as you are within connectivity of this watch. I do not think it uses different speakers for the size. This is not really something you will use very often as a speaker output. Taking calls is ok.
A:AnswerThis Apple Watch comes with the band as listed. However, Apple Watch bands are designed to be easily interchangeable so you can personalize the look and style. (Additional bands sold separately.)
A:AnswerThe difference in GPS and cellular option, GPS you have to have your phone nearby to answer texts and calls. Whereas cellular you can be away from it. Your watch would become a mini phone. I personally use to GPS version. I’m never that far away from my phone.
Hope this helped!