I would wait until they get field trials and do a launch in India (which is what Jio plans anyways). I think if they can do it at India scale and complexity - they can pretty much do it anywhere in the world. India scale is obvious - large geography and relatively dense population. Complexity because of unreliability of basic infrastructure (like guaranteed power supply, people digging over your network pipeline etc.)

I am usually a skeptic when it comes to claims made by companies in the Indian context, for example, my Jio connection is spotty at best in tier 2 city and very much a PITA if I go in the rural areas where the state owned BSNL is still the winner.