ONTARIO · CA · FCC DATA

Best cell phone coverage in Ontario Ontario, California

AT&T, T-Mobile and Verizon all report outdoor coverage of between 99.9% and 100% of Ontario, CA, so no carrier wins on outdoor coverage here.

Carrier-reported coverage from FCC carrier filings as of December 31, 2025, not measured signal. How these figures are read

RESULT · ONTARIO, CA

Coverage in Ontario, CA

Population 185,285 (Census 2024 estimate)

What stands out in Ontario

  • Verizon reports 99.4% of Ontario in a moving car, against 33.6% of California as a whole.
  • Beyond the city limits it thins: across San Bernardino County, Verizon reports 30.6% in a moving car, against 99.4% in Ontario.
  • 5G at 35/3 Mbps covers 99.9% of Ontario, against 47.7% of California.
  • T-Mobile loses the most of Ontario in a moving car: 99.9% outdoors, 87.4% in a car.
✓ ALL THREE WITHIN 0.1 POINTS
All three carriers
99.9–100%

AT&T vs T-Mobile vs Verizon in Ontario

=
Verizon
Outdoor
100%
In car
99.4%
=
AT&T
Outdoor
100%
In car
97.2%
=
T-Mobile
Outdoor
99.9%
In car
87.4%

4G and 5G across all carriers in Ontario

4G LTE
100%
5G 7/1
100%
5G 35/3
99.9%

Check your street on each carrier's map

Verizon coverage map → AT&T coverage map → T-Mobile coverage map →

Around Ontario, in San Bernardino County

The towns nearby where one carrier reports the least outdoors: Lytle Creek (T-Mobile 27.8%), Morongo Valley (T-Mobile 69.7%), Homestead Valley (AT&T 74.2%), Big Bear City (T-Mobile 80.4%).

Questions about coverage in Ontario

Q1

How does Ontario compare with the rest of California?

Outdoors Verizon 100% (state 64.3%), AT&T 100% (state 57.3%), T-Mobile 99.9% (state 51.4%); in a moving car Verizon 99.4% (state 33.6%), AT&T 97.2% (state 36.2%), T-Mobile 87.4% (state 26.8%).

ZIP codes mostly inside Ontario

91761, 91762, 91764.

See the statewide California comparison, or coverage in San Bernardino, Fontana, Garden Grove, Roseville, Hayward, Sunnyvale, Torrance, Orange, Santa Clara, Concord, Murrieta, Downey.

Cities with figures closest to Ontario's: Oceanside, CA, Fresno, CA, Waco, TX, Victorville, CA, Visalia, CA.