Carriers behind Wireless providers.

Mar 30, 2018
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Many wireless providers use different network carriers like H2O uses AT&T, Ultra Mobile uses T-Mobile. If I choose to buy H2O Wireless/ Ultra Mobile will I have the same network as I would if I go for At&T/T-Mobile? I agree that the AT&T network has amazing coverage but will the other wireless providers using the AT&T towers has the same coverage and Data speed?