I was initially a bit Meh about cellular connectivity, as long as the watch holds a list of contacts, you can just retrieve a number and use a pay phone in an emergency. However, it would be really sweet if the watch at least supported 800MHz LTE only (along with VoLTE obviously), only requires a small antenna and low cost LTE chip for the one frequency band. The watch already supports wifi calling on networks in the US, so that's a good start. I suspect this might be more like an Apple Watch 3 feature though, once SIM cards are embedded and the gap between the iPhone and the watch starts to diminish. Nevertheless, could be handy and never know what surprises Apple has in store for the Apple Watch 2. Incidentally, this could bring GPS support from the same chip to improve loading times and accuracy on maps, especially when phone is out of range, dead or left at home.