In Custer County, you’ll select from 4 mobile wireless carriers listed below. 33.4% of Custer County’s land area is covered by some kind of wireless service, as are 90.17% of Custer County’s 4,275 residents. 5G reception covers up to 74.09% of people while they are sitting at home. Note that we may have a financial relationship with some of the Custer County providers below. This does not influence what data we show, and helps us provide high-quality, detailed information for free.
Custer County, ID Top Cell Providers
Starter Phones Designed for Child Safety
Coverage:
T-Mobile Network
Data Speeds:
Same as T-Mobile below
Plans start at $29/mo.
View plans
Built-in Parental Controls | Approved Contacts Only | Parent-Controlled Internet Access
Plans include 5G where available.
Coverage:
T-Mobile Network
Data Speeds:
Same as T-Mobile below
Plans start at $15/mo.
View plans
Mint Mobile provides very affordable plans using the same network as T-Mobile throughout the United States. Learn more about Mint vs. other carriers.
Coverage:
86.25% of Custer County
96.67% of the USA
Data Speeds:
4G: 77.72% 3G or 2G: 84.19%
1-833-652-2264
More about AT&T Wireless in Custer County
AT&T Wireless Data Speeds and Coverage in Custer County
AT&T Wireless covers 86.25% of homes in the county with mobile data. The fastest cellular data speed available is 4G. Coverage by homes and land mass (the % of acres with cell coverage versus the total acreage in Custer County) is shown below.
Tech |
% Homes |
% Land |
|---|---|---|
4G |
77.72% |
8.62% |
2G or 3G |
84.19% |
18.44% |
4G is the fastest cell coverage for 77.72% of homes. 6.47% of homes can only receive 2G or 3G data. We rank AT&T Wireless as #3 out of 4 for a combination of coverage and speed among Custer County mobile providers.
AT&T Wireless Voice Quality in Custer County
4G voice is considered HD, and is available at 81.14% of Custer County homes. 84.19% of homes can make calls using older 2G or 3G voice technology.
T-Mobile 5G available in Custer County
Coverage:
85.05% of Custer County
97.12% of the USA
Data Speeds:
5G: 82.04% 4G: 80.47% 3G or 2G: 81.92%
More about T-Mobile in Custer County
T-Mobile Data Speeds and Coverage in Custer County
T-Mobile covers 85.05% of homes in the county with mobile data. The fastest cellular data speed available is 5G. Coverage by homes and land mass (the % of acres with cell coverage versus the total acreage in Custer County) is shown below.
Tech |
% Homes |
% Land |
|---|---|---|
5G |
82.04% |
10.64% |
4G |
80.47% |
7.91% |
2G or 3G |
81.92% |
9.45% |
5G is the fastest wireless internet and data speed for 82.04% of homes. 4G is the fastest cell coverage for 0.00% of homes. 0.00% of homes can only receive 2G or 3G data. We rank T-Mobile as #1 out of 4 for a combination of coverage and speed among Custer County mobile providers.
T-Mobile Voice Quality in Custer County
5G voice quality can be very clear, and is available to 82.04% of homes. 4G voice is considered HD, and is available at 84.65% of Custer County homes. 81.92% of homes can make calls using older 2G or 3G voice technology.
Coverage:
0.54% of Custer County
96.15% of the USA
Data Speeds:
4G: 0.43% 3G or 2G: 0.12%
More about Verizon Wireless in Custer County
Verizon Wireless Data Speeds and Coverage in Custer County
Verizon Wireless covers 0.54% of homes in the county with mobile data. The fastest cellular data speed available is 4G. Coverage by homes and land mass (the % of acres with cell coverage versus the total acreage in Custer County) is shown below.
Tech |
% Homes |
% Land |
|---|---|---|
4G |
0.43% |
0.03% |
2G or 3G |
0.12% |
0.03% |
4G is the fastest cell coverage for 0.43% of homes. 0.00% of homes can only receive 2G or 3G data. We rank Verizon Wireless as #4 out of 4 for a combination of coverage and speed among Custer County mobile providers.
Verizon Wireless Voice Quality in Custer County
4G voice is considered HD, and is available at 0.54% of Custer County homes. 0.32% of homes can make calls using older 2G or 3G voice technology.
Coverage percentages on this page are based on the percent of Custer County homes that would be covered by cellular service of any kind, unless specified as Custer County land area.
Fastest Cell Service Down to the Custer County Neighborhood
The map below shows where Verizon, AT&T, or T-Mobile are faster in Custer County, ID. Areas with no clear winner are shown as ties.
Overall, Custer County ranks #587 out of 804 counties for the fastest mobile internet network speeds in Idaho.

Best Custer County Cell Provider Key
The northern parts of the county feature better overall coverage for faster data. The opposite is true in the northwestern areas of Custer County where mobile data speeds are generally slower.
Best Coverage & Data Speeds in Custer County, ID: T-Mobile
Among the largest cell phone companies in the United States, T-Mobile has the best speed and coverage in Custer County. T-Mobile has 5G that covers 82.04% of the county. Cell service of any type reaches 86.25% of Custer County homes.
Cheap Options for Mobile Service in Custer County, ID
If the price of a Custer County mobile plan is a major concern for you, cheaper mobile plans are available as well. There are several options available in Custer County including pre-paid, no-contract plans that start as low as $15 per line. Many of these providers such as Mint, Boost, and Cricket partner with the three major carriers to provide excellent coverage nationwide. With these discount options, the price of your Custer County wireless plan will quickly rise if you add additional lines or features such as a hotspot or unlimited data.
Plans include 5G where available.
Coverage:
T-Mobile Network
Data Speeds:
Same as T-Mobile above
Plans start at $15/mo.
View plans
Mint Mobile provides very affordable plans using the same network as T-Mobile throughout the United States.
These providers all offer excellent coverage at a lower price compared to more well-known brands. Mint is generally regarded as the most affordable provider for unlimited data, with a high "throttle cap" of 35GB. Depending on where you live, you may prefer the AT&T network coverage offered by Cricket. Boost is a good option for international travelers.
Local Mobile Providers in Custer County, ID
The companies below provide service to areas smaller than the entire United States. For example, they may have a cell tower in Custer County, and then partner with larger national companies to provide national service for traveling customers. We display network partners to the best of our ability but cannot guarantee coverage or charges outside of Custer County and the providers’ coverage areas.
Coverage:
89.98% of Custer County
0.00% of the USA
Data Speeds:
4G: 86.21% 3G or 2G: 89.76%
More about Custer Telephone Cooperative in Custer County
Custer Telephone Cooperative Data Speeds and Coverage in Custer County
Custer Telephone Cooperative covers 89.98% of homes in the county with mobile data. The fastest cellular data speed available is 4G. Coverage by homes and land mass (the % of acres with cell coverage versus the total acreage in Custer County) is shown below.
Tech |
% Homes |
% Land |
|---|---|---|
4G |
86.21% |
25.88% |
2G or 3G |
89.76% |
31.50% |
4G is the fastest cell coverage for 86.21% of homes. 3.55% of homes can only receive 2G or 3G data. We rank Custer Telephone Cooperative as #2 out of 4 for a combination of coverage and speed among Custer County mobile providers.
Custer Telephone Cooperative Voice Quality in Custer County
4G voice is considered HD, and is available at 86.21% of Custer County homes. 86.56% of homes can make calls using older 2G or 3G voice technology.
Custer County, ID Mobile Network Coverage Maps | Voice, 4G & 5G

Custer County Fastest Speeds Key
Your mobile coverage in Custer County may vary based on your provider and location. The map above shows the fastest mobile data speeds in and around the county. To see coverage for an individual provider, click the provider's availability maps above.
There are several types of mobile coverage to consider when evaluating a carrier’s geographic reliability. 5G is the fastest mobile data connection in Custer County covering 74.09% of homes in the area while 4G covers 87.39% of the county. Overall, 90.17% of homes (4,179 people) and 33.4% of the land (1,643.5 square miles) are covered by some form of cell technology.
5G Coverage Map and Availability in Custer County

Custer County 5G Coverage Key
5G is currently the most advanced network available with speeds several times faster than 4G. 5G networks in Custer County cover 74.09% of homes with 5G voice and data. In total 7.88% or 387.9 square miles of Custer County are covered by 5G. The best 5G coverage in Custer County comes from T-Mobile with 82.04% coverage.
4G Coverage Map and Availability in Custer County

Custer County 4G Coverage Key
4G/LTE networks have become one of the nation’s most common mobile coverage types for data, and in some locations, voice calls. In Custer County, 86.22% of the area is covered by 4G data, and 87.39% is covered by 4G HD voice service. Custer Telephone Cooperative has the best 4G network in Custer County with 86.21% coverage.
Selecting the Best Cell Provider in Custer County for You
If you’re still struggling to choose a cell phone provider in the county, some of these facts may help you decide:
- Coverage to Custer County houses is best with service from Custer Telephone Cooperative, with 89.98% of homes covered.
- The best coverage across all Custer County land is provided by Custer Telephone Cooperative at 32.21% of land area covered.
- The current best 5G coverage comes from T-Mobile reporting 82.04% in Custer County.
- The best 4G coverage is obtainable with Custer Telephone Cooperative, covering 86.21% of Custer County.
- The top estimated average speed in Custer County, estimated at 58.25, Mbps is available through T-Mobile.
Mobile Service Counties Near Custer County
If you live near Custer County but aren’t technically in the county, or you like to explore the region a lot, your coverage availability and speeds may vary.
Enter your zip code here to find more precise mobile numbers on your exact location. Here are our mobile and cell phone guides for several popular locations in and around Custer County:
Counties close to Custer County
- Clark County, ID: worse coverage
- Washington County, ID: better coverage
- Crook County, OR: better coverage
- Johnson County, WY: better coverage
- Campbell County, WY: better coverage
- Meade County, SD: better coverage
- Haakon County, SD: better coverage
- Stanley County, SD: better coverage
- Hughes County, SD: better coverage
- Beadle County, SD: better coverage
Counties with similar populations to Custer County
- Winn Parish, LA: better coverage
- Yoakum County, TX: better coverage
- Appanoose County, IA: better coverage
- Archer County, TX: better coverage
- Archuleta County, CO: better coverage
- Yalobusha County, MS: better coverage
- Wrangell City and Borough, AK: worse coverage
- Woodruff County, AR: better coverage
- Wirt County, WV: worse coverage
- Ziebach County, SD: worse coverage








