The version with e-SIM is great. 4G connectivity allows to use it without an iPhone for making calls and sending messages over cellular network, Facetime, Viber, etc. Moreover, it can track your activity. The device is ideal for sports. For example, it is much easier to communicate with friends during skiing (in cable car or on a piste) using Apple Watch then any phone. You don't need to search for a phone in a pocket of your jacket or pants and also put it back because it is on your wrist.
the battery is enough for a day if you use 4G (independently from a phone) but not GPS+4G. In the last case the battery is going to last for 4-5 hours. If you use with an iPhone battery life extends to 2 days.…mehr