Jamul, CA Cell Phone Coverage Map & Network Rankings (2026)

Don’t overpay for a network that struggles where you actually use your phone.

Using FCC mobile coverage data across Jamul, CA zip codes, this guide compares the top-performing networks and the cheapest plans that use them.

Coverage rankings for Jamul, CA

Verizon currently ranks first for coverage in this area, with a coverage score of 91.2. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.


RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1Verizon91.297.3%97.3%89.3%76.8% -96 dBm
2T-Mobile91.195.4%95.4%84.2%74.3% -86 dBm
3AT&T88.897.5%97.5%85.0%80.1% -105 dBm

Scores include coverage area, network type, and average signal strength.


Cell phone coverage map for Jamul, CA

Zoom in for local detail. Tap or click a colored area to see coverage and signal details. On mobile, use two fingers to move the map.

Coverage Key
Less covered More covered
Darker areas mean the carrier covers more of that location.

Map data © OpenStreetMap contributors, © CARTO. Rendered with MapLibre. FCC BDC mobile coverage processed by Compare Wireless Carriers.

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Cell phone coverage by network in Jamul, CA

#1

Verizon

Coverage Score 91.2
In Jamul, CA
Overall
97.3%
4G LTE
97.3%
5G
89.3%
Fast 5G
76.8%
Average Signal -96 dBm
San Diego County, CA covered 77.7%
#2

T-Mobile

Coverage Score 91.1
In Jamul, CA
Overall
95.4%
4G LTE
95.4%
5G
84.2%
Fast 5G
74.3%
Average Signal -86 dBm
San Diego County, CA covered 71.7%
#3

AT&T

Coverage Score 88.8
In Jamul, CA
Overall
97.5%
4G LTE
97.5%
5G
85.0%
Fast 5G
80.1%
Average Signal -105 dBm
San Diego County, CA covered 73.4%

County coverage is shown for surrounding-area context and uses land-area only coverage.

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Coverage by ZIP code in Jamul, CA

ZIP code areas can extend beyond city limits, so this table is best used for local comparison around the city.

ZIP CodeAT&TT-MobileVerizon
91935 82.2% 82.1% 53.5% 46.7% -111 dBm 60.1% 60.1% 32.7% 21.1% -96 dBm 79.4% 78.4% 47.2% 28.4% -105 dBm
91978 98.4% 98.4% 94.2% 80.5% -108 dBm 98.4% 98.4% 94.2% 85.2% -85 dBm 100.0% 100.0% 96.9% 80.5% -97 dBm
92019 96.8% 96.8% 89.1% 73.8% -102 dBm 96.3% 96.3% 92.4% 85.8% -82 dBm 98.8% 98.8% 93.7% 82.1% -94 dBm

About The Coverage Data

Coverage and signal estimates are derived by Compare Wireless Carriers from carrier-reported data in the FCC’s National Broadband Coverage Map, last updated in June 2025. “Percent covered” shows how much of the city or ZIP code area has a carrier signal, whether weak or strong. Signal bars show the estimated average signal strength in areas of Jamul, CA where that carrier has coverage.

If a carrier says you should have service but you do not, run a challenge test with the FCC Mobile Speed Test App. The FCC uses those results to check carrier-submitted coverage data and requires a carrier response when enough tests show a pattern of inaccurate coverage reporting.