How to Check Cellular Coverage Before You Buy (Without Trusting a Map)

Every coverage map looks the same. A country shaped blob of confident color, with a legend that says "coverage" and a footnote that says "not a guarantee of coverage." The map has never been in your kitchen.

The good news is that you can find out whether cellular internet will work at your place in about fifteen minutes, for free, with a phone. This guide walks through the test, explains how to read the results, and covers what to do when the answer is "maybe."

Why maps are only a starting point

Coverage maps are computer estimates. They model how signal should spread from each tower across the terrain. They are useful for big questions like "is there service in this county." They are not built to answer "is there service in my back bedroom."

What a map cannot see:

• What your walls and roof are made of.
• The hill, the grain elevator, or the apartment block between you and the tower.
• Which side of your building faces the tower.
• Whether you are on the second floor or in the basement.
• Trees, and whether they have leaves right now.

Those details decide whether your connection is great or frustrating, and they are all things you can check in person. For the background, see what affects cellular signal.

The fifteen minute phone test

You need a phone. More than one is better.

1. Turn off wifi on the phone. You want to test cellular, not your current internet.
2. Go to where the modem would live. Pick two or three candidate spots: windows on different sides of the building, and the highest window you have.
3. At each spot, do something real. Load a video. Open a large web page. Make a short video call. Bars are only a hint. What matters is whether things work.
4. Note which spot felt best. That is where a modem would go.
5. Repeat at a different time of day if you can, such as a weekday evening, when more people are online.

Reading the results

• Everything works at one or more windows: you are a strong candidate. Placement will be easy.
• It works at one specific window and nowhere else: still a candidate. That window is where the modem goes. A modem sitting in the good spot all day will do better than a phone being carried around the house.
• It works outside but not inside: the building is blocking signal. Look for gaps: windows, glass doors, the floor above. See cellular internet in hard buildings.
• It barely works anywhere, inside or out: the location has weak signal. Cellular internet is probably not your best option, and we would rather tell you now. Our rural internet comparison covers the alternatives honestly.

The catch: phones are on different networks

Your phone tests your phone's network. Different carriers have different towers, so two phones in the same room can tell different stories.

We are a reseller. We buy wholesale access to a major national network with nationwide coverage, and we do not name it. So we cannot tell you "test with a phone on network X." What you can do is gather more evidence.

• Test with several phones on different carriers. Ask family, neighbors, and visitors what they get at your place. If the major carriers' phones all work at your windows, that is a very good sign. If only one works, the picture is less certain.
• Ask the neighbors. People know exactly which carriers work on their road. They have opinions and they will share them.
• Look at the pattern. If most phones from most carriers work indoors at your place, you are in a well covered area. If nobody's phone works, no modem will either.

The real test costs you almost nothing

A phone test is a strong hint. The only definitive test is the modem itself, in your window. We set things up so that running that test is low risk.

• No contract. Month to month.
• No activation fee, no install fee, free shipping.
• A $100 deposit that is refundable.
• If it does not work where you need it, cancel from your account, send the modem back within 30 days using the prepaid label, and the deposit returns within 10 business days of it arriving.

Monthly fees are not refunded, so the most you are out is one month of service. Compare that with options that need a technician visit, a dish purchase, or a term agreement before you find out whether they work. Our Coverage page and Refund Policy lay it out.

Testing for a home

• Start with windows facing the nearest town, highway, or hill with antennas on it.
• Test upstairs if you have an upstairs.
• Do not bother testing the basement, the interior hallway, or the closet where the old router lived. The modem will not be going there.

Testing for an RV, van, or truck

You are not testing one location. You are testing your pattern. Over a couple of weeks, note whether your phone has usable signal at the places you actually park overnight. If the answer is "usually," a cellular modem fits how you travel. If your favorite spots are all dead zones, it does not. See RV internet, van life internet, and internet for truck drivers.

Testing for a cabin or second home

Test on your next visit, and ask your guests to check their phones too. Cabins vary more than any other category, from fully covered to nothing at all. Our cabin and lake house guide has placement tips for log walls, lofts, and valleys.

Testing for a business or job site

• Test where the equipment will actually be: the counter, the office, the trailer.
• Test during business hours, when the area is busiest.
• Commercial buildings have more steel and concrete. Windows and doors matter more.
• For a site that does not exist yet, test from a vehicle parked where the trailer will go.

See job site internet for contractors for trailer placement.

What bars do and do not tell you

Bars are a rough summary of signal strength. Each phone maker decides what counts as three bars, so they are not comparable between devices. They also say nothing about how busy the tower is. Two bars that loads a video beats four bars that does not. Always test by doing something real.

Red flags

• You have to go outside to make a phone call.
• Texts send only from one corner of the porch.
• Every visitor comments on the lack of service.
• The nearest place anyone's phone works is down the road.

If that is your place, a cellular modem is unlikely to be the answer, and satellite or a local fixed wireless provider may be. We say so plainly in our rural comparison.

Green flags

• Phones work normally indoors.
• Video calls on cellular work from inside the house.
• Phones from more than one carrier work at your windows.
• You have never once thought about cell signal at home.

After you order: the ten minute placement test

When the modem arrives, do not just set it where the old router was. Take it to the spots that tested best with the phone, try each, and keep the winner. Our modem placement guide has the method. Ten minutes on day one is the best investment you will make in your connection.

Frequently asked questions

Do you have a coverage map?
Our Coverage page explains where service works, which is nationwide, wherever there is signal. We still recommend the phone test over any map, including ours.

Do you check my address for eligibility?
No. There is no address check. You decide whether to try it. See internet with no address check.

Which carrier's phone should I test with?
We do not name our network. Test with as many different carriers' phones as you can. Broad coverage across carriers is a strong sign.

My phone works great here. Is that a guarantee?
No, but it is a good sign. The modem in your window is the only real test, and the refundable deposit makes it a cheap one.

What if I test, order, and it still does not work?
Cancel from your account, return the modem within 30 days, and get your deposit back.

The bottom line

Skip the map. Walk your place with a phone, test the windows by doing something real, and borrow a few other phones to widen the picture. If things work indoors, order with confidence. If it is a maybe, the month to month plan and refundable deposit make the real test cheap.

See How it Works for what happens after you order.