SIMI VALLEY · CA · FCC DATA

Best cell phone coverage in Simi Valley Simi Valley, California

AT&T, T-Mobile and Verizon all report outdoor coverage of between 95.4% and 98.7% of Simi Valley, 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 · SIMI VALLEY, CA

Coverage in Simi Valley, CA

Population 125,778 (Census 2024 estimate)

What stands out in Simi Valley

  • T-Mobile reports 97% of Simi Valley outdoors, against 51.4% of California as a whole.
  • Simi Valley has the lowest AT&T figure in a moving car of the 51 mostly-land cities in California on this site: 77.2%.
  • Beyond the city limits it thins: across Ventura County, T-Mobile reports 44.1% outdoors, against 97% in Simi Valley.
  • 5G at 35/3 Mbps covers 89% of Simi Valley, against 47.7% of California.
✓ ALL THREE WITHIN 3.3 POINTS
All three carriers
95.4–98.7%

AT&T vs T-Mobile vs Verizon in Simi Valley

=
Verizon
Outdoor
98.7%
In car
74.5%
=
T-Mobile
Outdoor
97%
In car
70.8%
=
AT&T
Outdoor
95.4%
In car
77.2%

4G and 5G across all carriers in Simi Valley

4G LTE
99.6%
5G 7/1
93.5%
5G 35/3
89%

Check your street on each carrier's map

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

Around Simi Valley, in Ventura County

The towns nearby where one carrier reports the least outdoors: Frazier Park (Verizon 75.9%), Port Hueneme (AT&T 94.3%).

Questions about coverage in Simi Valley

Q1

How does Simi Valley compare with the rest of California?

Outdoors Verizon 98.7% (state 64.3%), T-Mobile 97% (state 51.4%), AT&T 95.4% (state 57.3%); in a moving car AT&T 77.2% (state 36.2%), Verizon 74.5% (state 33.6%), T-Mobile 70.8% (state 26.8%).

ZIP codes mostly inside Simi Valley

93065.

See the statewide California comparison, or coverage in San Jose, Stockton, Chula Vista, Moreno Valley, Ontario, Pomona, Torrance, Vallejo, Fairfield, Carlsbad, Murrieta, Costa Mesa.

Cities with figures closest to Simi Valley's: Thousand Oaks, CA, Nashville, TN, Provo, UT, Augusta, GA, Charleston, SC.