Custer County, ID Cell Phone Coverage Map & Network Rankings (2026)

Find the best cell phone network and plan to use in Custer County, ID

Coverage rankings for Custer County, ID

T-Mobile currently ranks first for coverage in this area, with a coverage score of 17.8. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1T-Mobile17.85.8%5.7%5.3%4.1% -90 dBm
2AT&T13.410.2%10.2%4.5%3.0% -112 dBm
3Verizon9.10.0%0.0%0.0%0.0% -105 dBm

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

Cell phone coverage map for Custer County, ID

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 Custer County, ID

#1

T-Mobile

Coverage Score 17.8
In Custer County, ID
Overall
5.8%
4G LTE
5.7%
5G
5.3%
Fast 5G
4.1%
Average Signal -90 dBm
#2

AT&T

Coverage Score 13.4
In Custer County, ID
Overall
10.2%
4G LTE
10.2%
5G
4.5%
Fast 5G
3.0%
Average Signal -112 dBm
#3

Verizon

Coverage Score 9.1
In Custer County, ID
Overall
0.0%
4G LTE
0.0%
5G
0.0%
Fast 5G
0.0%
Average Signal -105 dBm
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Coverage by city in Custer County, ID

Cities and towns are shown for county-level comparison. Coverage percentages use land-area only coverage.

CityVerizonAT&TT-Mobile
Challis, ID N/A N/A N/A N/A N/A 100.0% 100.0% 95.8% 87.5% -103 dBm 100.0% 100.0% 100.0% 100.0% -70 dBm
Clayton, ID N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Lost River, ID N/A N/A N/A N/A N/A 16.9% 16.9% 9.2% 5.6% -114 dBm 8.2% 8.2% 8.2% 8.2% -85 dBm
Mackay, ID N/A N/A N/A N/A N/A 100.0% 100.0% 100.0% 89.5% -92 dBm 100.0% 100.0% 100.0% 100.0% -69 dBm
Stanley, ID N/A N/A N/A N/A N/A 100.0% 100.0% 100.0% 100.0% -96 dBm 100.0% 100.0% 100.0% 100.0% -61 dBm