Carrierlytics City Coverage Guide

Sullivan, NH 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 Sullivan, NH ZIP codes, Carrierlytics compares the top-performing networks and the cheapest plans that use them.



Cell phone coverage map for Sullivan, NH

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 Carrierlytics.

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Cell phone coverage rankings by network in Sullivan, NH

#1

T-Mobile

Coverage Score 50.6
In Sullivan, NH
Overall
54.7%
4G LTE
54.7% avg. -99 dBm 4G LTE signal where 4G LTE coverage exists: avg. -99 dBm
5G
31.7% avg. -91 dBm 5G signal where 5G coverage exists: avg. -91 dBm
Fast 5G
18.6% avg. -84 dBm Fast 5G signal where Fast 5G coverage exists: avg. -84 dBm
Cheshire County, NH covered 73.9%
#2

Verizon

Coverage Score 33.7
In Sullivan, NH
Overall
71.6%
4G LTE
71.6% avg. -102 dBm 4G LTE signal where 4G LTE coverage exists: avg. -102 dBm
5G
0.2% avg. -120 dBm 5G signal where 5G coverage exists: avg. -120 dBm
Fast 5G
0.0%
Cheshire County, NH covered 89.0%
#3

AT&T

Coverage Score 32.9
In Sullivan, NH
Overall
74.0%
4G LTE
74.0% avg. -112 dBm 4G LTE signal where 4G LTE coverage exists: avg. -112 dBm
5G
6.6% avg. -120 dBm 5G signal where 5G coverage exists: avg. -120 dBm
Fast 5G
2.8% avg. -120 dBm Fast 5G signal where Fast 5G coverage exists: avg. -120 dBm
Cheshire County, NH covered 84.9%

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

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Best phone plans for Sullivan, NH

Best phone plans on T-Mobile's network for Sullivan, NH

50.6 T-Mobile coverage score Ranked #1 in Sullivan, NH
Best family plan
79.5 Value Score

T-Mobile Better Value

Fair Value

Price
$140.01/mo for 3 lines ($46.67/line)
Data
Unlimited
Hotspot
Unlimited
View plan
See all plans on T-Mobile Compare all phone plans

Coverage by ZIP code in Sullivan, NH

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

ZIP Code AT&T T-Mobile Verizon
03445 74.0% 74.0% 6.6% 2.8% 54.7% 54.7% 31.7% 18.6% 71.6% 71.6% 0.2% 0.0%

About The Coverage Data

Coverage and signal estimates are derived by Carrierlytics 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 Sullivan, NH 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.