Carrierlytics City Coverage Guide

Grand Isle, ME 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 Grand Isle, ME ZIP codes, Carrierlytics compares the top-performing networks and the cheapest plans that use them.



Cell phone coverage map for Grand Isle, ME

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 Grand Isle, ME

#1

T-Mobile

Coverage Score 78.1
In Grand Isle, ME
Overall
100.0%
4G LTE
100.0% avg. -99 dBm 4G LTE signal where 4G LTE coverage exists: avg. -99 dBm
5G
80.0% avg. -95 dBm 5G signal where 5G coverage exists: avg. -95 dBm
Fast 5G
40.0% avg. -90 dBm Fast 5G signal where Fast 5G coverage exists: avg. -90 dBm
Aroostook County, ME covered 16.0%
#2

AT&T

Coverage Score 43.2
In Grand Isle, ME
Overall
86.7%
4G LTE
86.7% avg. -116 dBm 4G LTE signal where 4G LTE coverage exists: avg. -116 dBm
5G
33.3% avg. -120 dBm 5G signal where 5G coverage exists: avg. -120 dBm
Fast 5G
13.3% avg. -120 dBm Fast 5G signal where Fast 5G coverage exists: avg. -120 dBm
Aroostook County, ME covered 26.7%
#3

Verizon

Coverage Score 39.2
In Grand Isle, ME
Overall
93.3%
4G LTE
93.3% avg. -106 dBm 4G LTE signal where 4G LTE coverage exists: avg. -106 dBm
5G
0.0%
Fast 5G
0.0%
Aroostook County, ME covered 33.3%

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

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Best phone plans for Grand Isle, ME

Best phone plans on T-Mobile's network for Grand Isle, ME

78.1 T-Mobile coverage score Ranked #1 in Grand Isle, ME
See all plans on T-Mobile Compare all phone plans

Coverage by ZIP code in Grand Isle, ME

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
04746 50.1% 49.0% 28.0% 16.7% 49.5% 49.5% 35.0% 19.1% 61.3% 61.3% 0.0% 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 Grand Isle, ME 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.