Taken UNICONNECT USA Sim for my recent trip. Travelled through 6 states in the USA and found the T-Mobile network following everywhere. Mostly was in Washington with travel to Newyork, New Jersey, Niagra etc and did not find any problem for network coverage. Data network was also working very well.
I opted for this product because the response for my queries were quick. The package promised unlimited local and calls to India. This worked perfectly during my 23 days visit to U.S.A.