Crestline, 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 Crestline, CA zip codes, this guide compares the top-performing networks and the cheapest plans that use them.

Coverage rankings for Crestline, CA

T-Mobile currently ranks first for coverage in this area, with a coverage score of 87.3. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.


RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1T-Mobile87.392.4%91.7%85.4%67.5% -92 dBm
2Verizon84.699.0%99.0%78.5%51.0% -99 dBm
3AT&T69.481.8%80.5%61.3%48.3% -113 dBm

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


Cell phone coverage map for Crestline, 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 Crestline, CA

#1

T-Mobile

Coverage Score 87.3
In Crestline, CA
Overall
92.4%
4G LTE
91.7%
5G
85.4%
Fast 5G
67.5%
Average Signal -92 dBm
San Bernardino County, CA covered 54.8%
#2

Verizon

Coverage Score 84.6
In Crestline, CA
Overall
99.0%
4G LTE
99.0%
5G
78.5%
Fast 5G
51.0%
Average Signal -99 dBm
San Bernardino County, CA covered 71.8%
#3

AT&T

Coverage Score 69.4
In Crestline, CA
Overall
81.8%
4G LTE
80.5%
5G
61.3%
Fast 5G
48.3%
Average Signal -113 dBm
San Bernardino County, CA covered 74.5%

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

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Coverage by ZIP code in Crestline, 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
92322 78.9% 77.6% 65.8% 39.5% -117 dBm 92.1% 90.8% 86.8% 63.2% -95 dBm 97.4% 97.4% 89.5% 50.0% -101 dBm
92325 83.7% 82.1% 60.0% 51.6% -113 dBm 91.6% 91.1% 83.7% 72.1% -91 dBm 99.5% 99.5% 74.2% 50.0% -99 dBm
92385 75.1% 75.1% 37.1% 28.3% -116 dBm 86.3% 85.9% 73.2% 41.0% -96 dBm 100.0% 100.0% 94.1% 74.1% -100 dBm
92391 100.0% 100.0% 97.8% 80.0% -98 dBm 100.0% 100.0% 100.0% 100.0% -84 dBm 100.0% 100.0% 82.2% 57.8% -93 dBm
92407 79.1% 79.1% 60.9% 46.6% -114 dBm 93.5% 93.4% 88.0% 70.7% -88 dBm 99.4% 99.2% 94.7% 83.3% -95 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 Crestline, 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.