AT&T

Varies by the second. Never above 3 bars. Often 1.
Was this review helpful to you?MetroPCS

I can't make phone calls at my work building on Harbor Bay. :-( I get text messages but they seem to be delayed. I have to go outside if I want to call someone. Metro works better when I'm at home on Thurles Pl. Certain areas in the house doesn't work but one room facing the window usually works. I have to go outside my friends' houses on Marianas and Mangrove to make a call.
Was this review helpful to you?AT&T

Reasonable outdoor reception. Poor / Very poor indoor reception. AT&T tower is on Montara peak so the steep hill west of Seville is likely weakening signal.
Was this review helpful to you?Verizon

Terrible coverage in downtown San Carlos. Shows 4 bars and LTE but will not load webpages or apps. Has gotten worse in past year?? Often have to switch to 3G
Was this review helpful to you?Verizon

Have had Verizon for over 6 years. This last year started working in San Carlos. I have 4 bars but dropped calls all the time. I have LTE but can't load websites or check email. Seems like no carrier has their act together around here.
Was this review helpful to you?Verizon

We bought a property from people who used ATT and said they could get cell reception often. We show as low as 1 bar sometimes but have never failed to get signal and usually get 3 and 4GLTE (Verizon style.)
Was this review helpful to you?AT&T

Terrible! 1-bar. 2-bars occasionally. When I upgrade my iPhone I will be gone to Verizon. After all, this is the center of Silicon Valley! Also had to return AT&T microcell. It would not lock on poor AT&T signal.
Was this review helpful to you?Sprint

They should self their self to Verizon because they are terrible
Was this review helpful to you?Sprint

Sprint sucks and the only reason they get service is because they roam and use verizons signal because they use the same cdma technology
Was this review helpful to you?AT&T

I get service every where and its fast. so much better then sprint.
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