I just noticed google have something call google Fi, I don’t know much about it but did a quick look at the pricing plan. First look comparison with Metro PCS, I think Metro PCS is better with unlimited data and text and call $25 each phone for 4 phone plan.
While google Fi appear to be $40 a month. I do not think that it’s google network, but google just using existing network antenna signal from your location just like many other cellular service. Now a day I don’t think it matter much anymore which company you decide use, there are only types, one is CDMA and one is GMS, there is a third which I think is satellite phone which I think using satellite instead of local nearest cellular service antenna.
CDMA is a little bit weaker than GSM, since GSM antenna are installed more than GSM.