Since you don't really need to have your iPhone, iPad or iMac connected to the same wifi or bluetooth to receive or sent SMS and phone calls. If you leave your iPhone at home and carry your iPad or Macbook around, you can technically still make phone call and sent SMS while you are in another country, you just need your iPad or MacBook be connected to wifi all the time.
Can anyone confirm if my theory is workable?
Can anyone confirm if my theory is workable?