Best cellular provider in the Bay

Verizon best coverage. I use Google fi because it's cheap and I don't need much data.

xfinity mobile--jk

Verizon and AT&T are comparable in the Bay Area. This is a general consensus. T-MOBILE doesn't have the bands to go thru buildings in SF like AT&T does (though their coverage is good). And forget Sprint --it's trash. Try Red Pocket AT&T for the cheapest plan. You'll save a lot with these guys versus the regular AT&T plan. Check the Reddit forums for more discussons on the matter.