Phone with SIM cardSource: Android Central

Having good cellular service has become an important thing for most people. We use our phones for everything from keeping in touch to keeping entertained when we have a few quiet moments. It's pretty great that we have such powerful machines in our pockets and nobody is happy when their service lets them down. That's why it's worth taking your time and checking out a few things before you switch carriers.

This can be especially important when switching to a prepaid alternative carrier, also known as an MVNO. Because they aren't the ones installing new facilities and building out the physical networks they operate on, they sometimes have to do things a little differently. These differences usually mean the service is cheaper every month, but it can also pose a few problems if you haven't done your homework before you made the switch.

Amazon's 12 Days of Deals is here with big discounts for all

What is an alternative carrier?

That's what we're here for! Android phones and the service that powers them is our job and our hobby. We love to get in the mix and try things like switching away from the Big Four as much as we like writing about it. With that in mind, here are some things you need to think about when you're ready to switch to an MVNO as your new carrier.

Picking the carrier that works where you need it to

Coverage needs to be the first thing you look at. MVNOs have the luxury of using the networks the Big Four have rolled out, and we all know that not everyone has equal coverage on every carrier.

US Mobile plans banner

One of the best things you can do is talk to people you know and see what service they are using. If you hear a lot of praise for one particular carrier and complaints about another, you have a good starting point when it comes to picking the right MVNO. You can also check out the carrier coverage maps.

Sprint coverage map sample December 2019Source: Sprint

You need to make sure you know what you're looking at here. Nobody is trying to deceive you, but they all want their map to look as good as it can. A lot of these maps include extended coverage, which is really coverage purchased from another carrier. While this can be a great way for carriers to quickly fill in dead spots on coverage maps, the experience might not be as consistent as standard service.

A lot of MVNOs don't have this same extended coverage either, so you should also check the specific coverage maps on the website or app for the carrier you are considering. At the same time, some carriers like US Mobile let you choose between two different LTE networks, and Google Fi combines three networks into one for compatible phones.

Finally, be cautious if you need to use your phone in areas on the fringe or edge of coverage maps. The maps are never exact, and if the map tells you service will degrade just a few blocks from where you need to be covered, you might not get service at all. These maps should be considered as a good estimate rather than any sort of exact science.

Switching to US MobileSource: Android Central

Match your phone with the right network

One of the best parts about using an MVNO is that you can save even more money by using the phone you already paid for. As long as your phone works on at least one of the Big Four carriers in the U.S. there's an MVNO that offers great service for you.

It's not that difficult to make sure the MVNO you want to use supports the phone you already have. If you're up on all the technical jargon you can check the radio bands on your phone against the radio bands listed on every alternative carrier's website. You'll usually find these on the FAQ portion and if they match, you're in business.

If you don't want to get bogged down in frequency numbers and all the different network bands, sites like WillMyPhoneWork can tell you if your phone is compatible with most any network worldwide.

Keep in mind that the more network bands your phone can access on a carrier, the more complete your coverage will be. T-Mobile, for example, relies on a newer 600Mhz band to increase its coverage that isn't supported on all older phones.

Visible app phone compatibilitySource: Android Central

We've built a list of popular MVNO carriers and which networks they operate on that can answer many of your questions right away!

How to make sure your phone works on a prepaid alternative carrier

You might need to get your phone unlocked

Most phones will need to be SIM unlocked before they can be used on another carrier. This has nothing to do with your phone's security (that's a different type of unlocking) and only lets your phone accept programming for a new network. Carriers have their phones SIM locked as a way to cut down on equipment loss — a locked phone only works on the carrier who locked it, and only as long as you're making the payments.

SIM unlocking won't affect your phone's security.

In the U.S., carriers are required to unlock a phone once it's paid for. Most will also unlock a phone after you've been a customer for a while as a show of good faith. You can get your phone unlocked by the carrier by making a phone call or going into a store. Customer service will be happy to help you provided you've met any obligations they require.

Getting your phone SIM unlocked is easy

There are also third-party unlocking services that will send you a code to unlock your phone. If you go this route, be sure to do a quick web search on the company to make sure they have decent customer feedback. Getting your phone unlocked by a third party is exactly the same as having a carrier do it; once you enter the code, you're good and can use a phone on any compatible network.

Screen showing data usageSource: Android Central

Know how much data you need

Most of us don't need unlimited data. The Big Four have been moving to unlimited plans for most people with the main difference between plans being speed and extras like hotspot capabilities. But if you're not someone who needs a ton of data every month you're probably overpaying if you sign up for one of them.

You can check how much data you've used recently pretty easily. Your phone has a setting in the Wireless and networks section that tells you how much you have used in the past 30 days, but it's a good idea to get a bigger sample size here.

At your carrier's website, on your bills, or in your carrier's app you should find a statement for the past few months that will show how much data each phone number on the account used. Get an average for the past couple of months, then add 1GB to it for a "just in case" bumper.

US Mobile plans banner

Take this number and look at the MVNO you're considering. Chances are there is a plan that will cover what you need. The best part? You don't have a contract and can adjust things next month if you need to!

What happens if you use all of your data for the month?

Life isn't static. Even with careful planning, you might have a month where you had to use more data than you budgeted. It's important to know what happens and how you can add more data on a temporary basis.

Most every MVNO will sell "extra" data in 1GB increments. It's usually a little more than it would be if it were bundled into a pre-packaged plan, but it won't be outrageous. Most companies charge about $10 per GB.

Buying extra data is always easy, but make sure you know how to do it before you need it.

What you need to do is check how you can add it right from your phone, so when you're close to using your allotted amount you can tap a few buttons and fill up your data bucket. Most of the time, your carrier will have an app that can accomplish this. You'll find specific information on the company's website along with any other services they offer, such as international roaming or auto-refilling.

Some carriers will simply cut off your data but others will slow it way down but keep it working. This slower data can receive emails and messages, but that's about it. Anything else will feel like you've gone back to dial-up days unless you can hook on to a Wi-Fi point. Don't get stuck with no data and no way to buy more!

Data limitSource: Android Central

Some things cost extra or are not available

Wireless carriers can be strict about what they allow on their networks, and MVNOs are no different. For the most part, an MVNO's business model — buy wireless service in bulk and resell with no frills — means it will have some restrictions on what you can and can't do, like tethering your phone or using your phone to call and text with someone outside of the U.S.

Chances are none of us are planning to run a server from our phone, but if you want to tether a laptop or tablet through your phone once in a while or call and text relatives in Mexico, you need to know the rules so you know what to expect. Many MVNOs will have simple and cost-effective add-ons you can apply if you need more than just the basic service.

There most likely is an MVNO that will work for you, you'll just want to be sure you have the right one. Just take the time to read the terms and see what you can and can't do while using the service. If you're unsure of anything you see, call or chat with a sales rep through the website and get squared away.

5G and MVNOs

5G is still new and for many, an unnecessary upgrade. It's still nice to know that some MVNOs are already planning for the next generation. Metro by T-Mobile is jumping into 5G alongside its network provider, T-Mobile. As 5G networks mature, 5G will likely trickle down to more MVNOs as well.

Advanced features may not work

Many of us have phones that support things like HD voice calls (VoLTE) or Wi-Fi calling. They're nice features if you use them regularly, but most of the time they are very phone- and network-specific. An MVNO may not have them at all, or you may need phones designed to run on a specific carrier to use them.

Advanced calling features could require very specific phones.

This works the same way for the Big Four, though, support for unlocked phones is improving all the time. Because most MVNOs don't sell phones under their own brand, you'll have to investigate if any of the features they offer need a specific brand of phone.

US Mobile plans banner

US Mobile offers Wi-Fi calling, and it works really well — as long as you have a phone that supports T-Mobile's Wi-Fi calling feature. Verizon offers its own Wi-Fi calling, and it's also supported on US Mobile. Most phones that support Wi-Fi calling are built to work on both networks so you're OK with either a Verizon or T-Mobile phone, but not a Sprint or an AT&T phone. It can be a little confusing even to smartphone veterans!

Read our US Mobile review to learn more

You don't need any of these extras to have good, cheap cellular service. That's the best part. But if you see something you don't understand, you can drop a question in the comments and someone can help give you an answer.

Mint Mobile SIMSource: Android Central

Prioritization is a thing

Prioritization means a carrier like T-Mobile identifies which phones using the network are doing it through an MVNO and gives priority to its direct customers. Only a certain number of phones can be connected to a cell tower at a time, and we're always switching on and off to make sure everyone has a turn. We've all probably been somewhere that a lot of people were using their phones and the service got really slow — that's because the lines to get your turn were long and you noticed the wait time.

When things get extreme, MVNO customers can experience even slower service because direct customers are given priority. I use MVNO carriers almost exclusively because I love the value they offer. But I do get to see prioritization in action every year on The Mall in Washington, D.C. during the annual July Fourth celebration. There are three-quarters of a million people jammed into a four-block area, and we're all on our phones. Folks who pay AT&T (for example) directly for service have very poor service. People like me using an MVNO have practically no service.

There's nothing you can do about this, and no secret hack you see on the internet is going to work. It just happens when there are way too many people using just a few towers. Tower upgrades are improving things and in the future, 5G should help as well. The rest of the year, I get the same service I would have from one of the Big Four at a much lower price.

Bonus number 9 thing!

You're going to have extra money every month. You'll have the service you are used to in most every way, but it costs a lot less and you only have to pay for the amount you'll need. Some MVNOs only charge you for the exact amount you use!

Saving enough for a nice night on the town because you switched phone companies is a great feeling. You'll love it.

Updated December 2019: We made sure the information was still great and relevant for the latest phones.

We may earn a commission for purchases using our links. Learn more.