Thinking of Leaving T-Mobile? Check Verizon and AT&T Coverage First

Whatever has you looking, a higher bill, a change to your plan or a bad month of service, the first question is the same. Does the carrier you would move to actually cover your home, your work and the road between them? A switch that saves money and loses signal in your kitchen is not a saving.

This guide is the coverage check to do before you leave T-Mobile for Verizon or AT&T. It goes from wide to narrow in four steps and ends with a test on your own phone, with your T-Mobile line still running. It does not go into T-Mobile's charges or fees. Those are on your own bill and account, and they change.

Why coverage comes first

The three national networks are not copies of each other. Each one built its towers in different places, on different frequencies, in a different order. A carrier that is strong across your state can still be weak on your street, and the reverse is just as common.

The national picture shows how different they are. By share of US area, Verizon reports the most 4G LTE coverage, then AT&T, then T-Mobile. For 5G the order changes: T-Mobile reports the most, then AT&T, then Verizon.

Read that carefully. It means a move away from T-Mobile can gain you coverage in one place and cost you 5G in another, depending on where you are. A national order tells you nothing about one address, which is why the steps below narrow down.

Step 1: compare all three for your area

Start with our state and city pages. Each one shows the share of the area where AT&T, T-Mobile and Verizon report 4G LTE or 5G, outdoors and in a moving car, side by side. A page names a leader only where one carrier is clearly ahead, and says so when there is no clear leader.

Look at T-Mobile's row first. If T-Mobile reports as much as the other two where you live, coverage is not a reason to expect better service after a switch, and you can weigh the move on other grounds. If Verizon or AT&T reports clearly more, you have a candidate.

Check the in-car figure if you drive a lot, and check every place that matters, not only home. These figures are reported coverage, not measured signal, and they stop at the city or county level. They narrow the choice. They do not settle it.

Step 2: the candidate's own map, at your address

Verizon and AT&T each publish a coverage map. Find your home, your workplace and any place your T-Mobile phone struggles today.

Know what you are looking at. Verizon says its map shows approximate outdoor coverage and is not a guarantee of service. AT&T says the same of its own map: approximate outdoor coverage, and actual coverage may vary. Neither map knows about your walls, your basement or the hill behind your house.

Each carrier also draws its map its own way, so do not set one carrier's map against the other's to pick a winner. Use each map to ask one question about one carrier: does it claim to cover this address at all? Our address guide goes through this step in more detail.

Step 3: try it on your own phone before you move

This is the step that settles it, and it no longer requires leaving anyone. Verizon and AT&T each offer a free trial of their network that installs as an eSIM on the phone you already have. Your T-Mobile line and your number keep working beside it, and you switch between the two networks to compare.

Verizon asks you to check that your phone is unlocked and works with eSIM before you start. AT&T asks for a compatible iPhone or Android phone. The terms of each trial are on the carrier's own site and can change, so read them there.

Then test where it counts. Stand in the rooms where you use your phone and make a call. Load a page in the basement, the garage, the back bedroom. Drive your commute with a passenger watching the signal. Try the busy hours, since a network can have a strong signal and still crawl in the evening.

Use them in this order. Each step is quicker than the next and rules out more.

Step 4: check that your phone can come with you

A phone bought from a carrier is often locked to it until the carrier's conditions are met. On an iPhone, open Settings, tap General, then About, and look at Carrier Lock. If it reads No SIM restrictions, the phone is unlocked. On Android the menus differ by maker, so ask T-Mobile.

If the phone is locked, ask T-Mobile what it takes to unlock it before you plan around a date. Verizon's trial asks for an unlocked phone too, so this is worth finding out early.

An unlocked phone also has to support the new network's frequency bands. Recent iPhones and flagship Android phones generally do. For anything older or less common, use the compatibility check on the new carrier's site before you count on it.

Moving your number without losing it

If the test goes well, the new carrier moves your number for you. Verizon's instructions are plain on the order: do not cancel your existing service while the number is being moved, because the old account disconnects by itself once the move is complete.

Verizon says you will need your current carrier's account number and a transfer PIN, which your current carrier provides and which is not the same as your account PIN. That means getting one from T-Mobile. AT&T's process was not read for this guide, so ask AT&T what it needs, but the rule about not canceling first is the safe one to follow with either.

If neither one is better where you live

Sometimes the check ends with T-Mobile as the strongest of the three at your address. That is a result, not a failure. It means a switch would have cost you signal.

You still have choices. A different T-Mobile plan may answer what is bothering you. Smaller brands that run on T-Mobile's network reach the same places under their own terms. And if the trouble is one dead spot, a second line on another network can cover it without giving up the first.