What does the T-Mobile 5G coverage map actually show?

What is the difference between Extended Range and Ultra Capacity?

<p><strong>TL;DR.</strong> Extended Range 5G is 600&nbsp;MHz low-band. It covers most of the map and runs at roughly LTE speeds. Ultra Capacity is 2.5&nbsp;GHz mid-band, inherited from Sprint, and is the one that delivers several hundred megabits. Both show as 5G on your phone, and the coverage map distinguishes them only by shade.</p><p>This single distinction explains most complaints about T-Mobile 5G being slow. A phone parked on Extended Range in a rural county is working exactly as designed. The same phone twenty miles closer to a metro area, on Ultra Capacity, is a different product.</p>

How much of the T-Mobile network is the legacy Sprint build?

<p>A large share of it. The FindTower database records 2,703,805 cells under T-Mobile network codes plus 1,612,971 under legacy Sprint codes, which have been folded into the same network since the 2020 merger. That combined footprint is what makes T-Mobile the densest recorded US network, ahead of AT&amp;T at 2,694,558 and Verizon at 1,225,037.</p><p>The Sprint 2.5&nbsp;GHz spectrum is precisely what became Ultra Capacity. Where Sprint had built out, T-Mobile mid-band arrived early; where Sprint had not, it has arrived slowly. That history predicts local T-Mobile 5G quality better than any coverage map does.</p><p class="ft-caveat"><em>A cell record is one transmitting sector, not one mast. A single tower commonly carries three sectors per band per carrier, so these counts track how densely a carrier transmits rather than how many structures it owns. Counts come from the FindTower database, last rebuilt on 2025-11-22.</em></p>

How do you check T-Mobile 5G at your own address?

<p>Look at recorded cells rather than shaded polygons. The coverage map is a prediction; a plotted cell with a bearing and a distance is an observation. If the nearest recorded T-Mobile cell is four miles away, no shading on a map will change what happens in your living room.</p><p>Then confirm with a trial eSIM before porting a number. T-Mobile offers one at no cost, and a week of real use at your kitchen table settles the question that maps and cell counts can only estimate.</p>

Related guides

<ul><li><a href="https://findtowerapp.com/coverage-map-comparison">Compare AT&amp;T, Verizon and T-Mobile coverage</a></li><li><a href="https://findtowerapp.com/tmobile-towers-near-me">Find T-Mobile towers near you</a></li><li><a href="https://findtowerapp.com/5g-towers-near-me">How to find 5G towers near you</a></li><li><a href="https://findtowerapp.com/coverage">Coverage maps by state and city</a></li><li><a href="https://www.fcc.gov/BroadbandData" rel="nofollow noopener">FCC National Broadband Map</a></li></ul>

Key takeaways

<ul><li>Extended Range 5G is 600 MHz low band and runs at roughly LTE speeds.</li><li>Ultra Capacity is 2.5 GHz mid band, inherited from Sprint, and is the fast one.</li><li>Your phone shows the same 5G icon for both, and for mmWave.</li><li>T-Mobile records 2,703,805 cells plus 1,612,971 legacy Sprint cells in the FindTower database.</li><li>Where Sprint had built 2.5 GHz, Ultra Capacity arrived early. Where it had not, it did not.</li></ul>

Frequently Asked Questions

What is the difference between T-Mobile Extended Range and Ultra Capacity 5G?

Extended Range is 600 MHz low-band 5G that reaches several miles at roughly LTE speeds. Ultra Capacity is 2.5 GHz mid-band inherited from Sprint, reaching about a mile and delivering several hundred megabits. Your phone shows both as 5G.

Why is my T-Mobile 5G slow?

You are almost certainly on Extended Range low-band rather than Ultra Capacity. Low-band 5G runs on repurposed spectrum and performs like good LTE by design. Check Field Test mode on iPhone to see which band you are actually connected to.

How much of T-Mobile is the old Sprint network?

A substantial share. The FindTower database records 1,612,971 cells under legacy Sprint network codes alongside 2,703,805 under T-Mobile codes. The Sprint 2.5 GHz spectrum became the Ultra Capacity mid-band layer after the 2020 merger.

Does T-Mobile have the most towers in the US?

By recorded cells it has the densest network in the FindTower database at 2,703,805, with AT&T close behind at 2,694,558 and Verizon at 1,225,037. Cell records are transmitting sectors, not masts, so this measures density rather than structures.

How can I check T-Mobile 5G at my address?

Look at recorded cells with bearing and distance rather than the shaded coverage map, which is a prediction. Then run a free trial eSIM for a week at the address before porting your number, since indoor performance is what maps model worst.