San Francisco packs steep hills, dense towers, and heavy transit into seven square miles. T-Mobile leads on 5G speed; Verizon is the steadiest indoors and on the hills. Here’s the neighborhood-by-neighborhood breakdown.
US MobileVerizon / T-MobileMatches network you pick$$9.2
VisibleVerizonGreat value, may deprioritize$8.3
Local considerations & tips
Hills & Fog
Steep hills create signal shadows block to block; Verizon and AT&T low-band and Wi-Fi calling perform best indoors.
BART & Muni
Underground BART and Muni Metro coverage is generally good; T-Mobile and Verizon are the most consistent in the tunnels.
Dense Daytime Demand
Downtown and SoMa pack heavy weekday demand; priority-data or postpaid plans hold speed at peak.
San Francisco plan FAQ
Which carrier is best in San Francisco?
T-Mobile posts the fastest 5G nationally in Ookla's H1 2026 report. Both are strong: pick T-Mobile for speed, Verizon for coverage.
What’s the cheapest good plan in San Francisco?
Mint Mobile on T-Mobile from $15/mo for light users, or Visible+ at $35/mo flat for Verizon’s network with taxes included.
Do budget carriers work well in San Francisco?
Yes. MVNOs like Mint (T-Mobile), Visible (Verizon), and US Mobile ride the same networks and perform close to postpaid most of the time, except during peak congestion.
Bottom line
In San Francisco, T-Mobile’s fast 5G and Verizon’s reliability lead. Get either cheaply through US Mobile or Visible, and test coverage at your exact address on a free trial first.
Sources
Verizon, T-Mobile and AT&T coverage maps for San Francisco
Plan prices from our plan reviews; see each review for its checked date