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



Cell phone coverage map for Grulla, TX

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, © OpenMapTiles. Basemap by OpenFreeMap. Rendered with MapLibre. FCC BDC mobile coverage processed by CompareWirelessCarriers.

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Cell phone coverage rankings by network in Grulla, TX

#1

AT&T

Coverage Score 82.4
In Grulla, TX
Overall
100.0%
4G LTE
100.0% avg. -102 dBm 4G LTE signal where 4G LTE coverage exists: avg. -102 dBm
5G
94.2% avg. -106 dBm 5G signal where 5G coverage exists: avg. -106 dBm
Fast 5G
90.9% avg. -106 dBm Fast 5G signal where Fast 5G coverage exists: avg. -106 dBm
Starr County, TX covered 91.6%
#2

T-Mobile

Coverage Score 79.9
In Grulla, TX
Overall
90.9%
4G LTE
90.9% avg. -97 dBm 4G LTE signal where 4G LTE coverage exists: avg. -97 dBm
5G
75.3% avg. -92 dBm 5G signal where 5G coverage exists: avg. -92 dBm
Fast 5G
57.1% avg. -89 dBm Fast 5G signal where Fast 5G coverage exists: avg. -89 dBm
Starr County, TX covered 72.1%
#3

Verizon

Coverage Score 76.3
In Grulla, TX
Overall
100.0%
4G LTE
100.0% avg. -94 dBm 4G LTE signal where 4G LTE coverage exists: avg. -94 dBm
5G
66.9% avg. -96 dBm 5G signal where 5G coverage exists: avg. -96 dBm
Fast 5G
34.4% avg. -91 dBm Fast 5G signal where Fast 5G coverage exists: avg. -91 dBm
Starr County, TX covered 100.0%

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

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Coverage by ZIP code in Grulla, TX

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

ZIP CodeAT&TT-MobileVerizon
78548 100.0% 100.0% 94.2% 90.9% 90.9% 90.9% 75.3% 57.1% 100.0% 100.0% 66.9% 34.4%

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 2026. “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 Grulla, TX 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.