How to Switch Phone Carriers: 6 Questions to Answer First (October 2026)

How to Switch Phone Carriers in 7 Steps

Picture the classic mistake: you cancel the old plan on a Friday, the number goes with it, and the weekend disappears on hold. Order matters. Here’s the order that works, and each step links to the question below that covers it in more detail.

1. Check what you still owe. Read your current agreement for early termination fees, device payments and any promo discount you’d have to pay back. More on leaving costs.
2. Check that your phone is unlocked and compatible. A locked phone won’t activate on another carrier, and an unlocked one still has to work with the new network. More on your phone.
3. Check coverage where you actually spend time. Home, work, the commute, your parents’ place. More on coverage.
4. Pick the new plan on its real monthly cost, with taxes, fees and AutoPay conditions counted. More on choosing a plan.
5. Get your account number and Number Transfer PIN from your current carrier, and turn off any number-lock feature. Do this close to switch day, because PINs expire. How to get them at Verizon, AT&T and T-Mobile.
6. Sign up with the new carrier and ask it to transfer your number. Give it your 10-digit number, account number, PIN and billing ZIP code. Keep your old service active, and back up contacts, voicemail and texts before the move.
7. Wait for the port, then tidy up. Once your number is working on the new phone, cancel any leftover lines on the old account (a watch or tablet line, say) and watch for a final bill.

That’s the whole job. The six questions below are the homework behind steps 1 to 5, and they’re where people usually get stuck.

1. Can I Keep My Number When Switching Carriers?

Yes, in almost every case. The FCC’s porting guide says that if you change providers and stay in the same geographic area, you can keep your existing number, whether you’re moving between wireless, landline or internet phone companies. The process is called porting.

A few things in that guide are worth knowing before you start:

• Your old carrier can’t hold your number hostage. Once you request service from a new company, your old company can’t refuse to port your number, even if you owe it money for a balance or a termination fee. (You still owe the money. More on that under leaving costs.)
• It should be quick. FCC rules require simple ports to be processed in one business day, and between wireless carriers you may be up and running within a few hours. A landline moving to a cell phone can take a few days.
• Fees are possible, but not universal. The FCC says companies may charge to port a number and that you can ask for the fee to be waived. Verizon’s port-out FAQ says it doesn’t charge a specific fee for moving numbers, and T-Mobile’s number transfer page says there’s no charge for transferring numbers to it.
• Moving house can complicate it. If you’re also moving to a new area, the FCC says you may not be able to keep the number.

Getting your account number and Number Transfer PIN

This is the one step that trips people up. Your new carrier needs proof that you, the account holder, want the number moved. That proof is your account number plus a Number Transfer PIN, a short code your current carrier generates on request so nobody can walk off with your number. Here’s how the three big carriers handle it for personal accounts, straight from their own help pages.

Some small print from those pages. At Verizon and AT&T, one PIN covers every number on the account, so tell the new carrier exactly which lines you’re moving. T-Mobile also asks you to have your T-Mobile account number (it’s on your bill) and your account PIN or passcode ready. AT&T suggests getting the PIN close to the day you submit the transfer, which makes sense given it lapses in 4 days. Verizon adds a warning worth repeating: guard the PIN and account number, and share them only with your new carrier. T-Mobile Prepaid customers get their PIN from a different screen: My Profile, then Request Transfer PIN.

With another carrier? Its steps will differ, so ask the new carrier what it needs and look up your current carrier’s own transfer instructions before switch day.

2. Will My Phone Work With the New Carrier?

Bringing your own phone (BYOD) saves the cost of a new one, but it hinges on two separate things: whether the phone is unlocked, and whether it’s compatible with the new network.

Is it unlocked?

Many phones sold in the US are locked to the carrier that sold them. According to the FCC’s cell phone unlocking guide, locked phones usually stay that way until the installments are paid off or for a set period, and even a phone bought at full price may be locked for a short time, such as 60 days, to deter theft and fraud. The FCC’s advice is blunt: unless a phone was sold as unlocked, it’s probably locked. Locking applies to eSIMs as well as physical SIM cards.

The good news is that the nationwide carriers follow the CTIA’s unlocking standards, which the FCC summarizes like this:

• Postpaid: carriers unlock an eligible phone on request once the contract or device financing is finished, or the early termination fee is paid.
• Prepaid: carriers unlock on request no later than one year after the phone was first activated, subject to reasonable time, payment or usage requirements.
• Speed and cost: carriers respond within two business days, and don’t charge customers or former customers extra to unlock an eligible phone.

One catch: if you owe your carrier money or haven’t met your contract terms, the FCC says it may not unlock the phone until you do. AT&T’s transfer page puts it plainly too: unlock your AT&T device before you try to use it on another provider’s network.

Is it compatible?

Unlocked doesn’t automatically mean it’ll work. The FCC points out that carriers use different frequencies and technologies, so unlocking a phone built for one network may not make it compatible with another. Check your exact model against the new carrier’s compatibility list before you order a SIM or start a transfer.

3. Does Leaving My Carrier Cost Anything?

You can request service from a different company at any time, the FCC says. Whether leaving costs you anything depends on what you signed. The FCC tells switchers to review their contract first, because it may include early termination fees or balances you’re still on the hook for. Verizon’s port-out FAQ spells out its own version:

• An early termination fee if your line has a minimum contract term you haven’t finished.
• Any remaining device payment balance, which you have to pay off.
• Promo discounts with a minimum term: leave early and you repay the monthly discounts you’ve received so far, capped at a rolling maximum of 6 months.

Switching offers that promise to cover what you owe come with their own conditions, so read them before you count on one. And remember the other side of the ledger: what the new carrier charges you to join.

So a single new Verizon line starts with a $40 activation fee, and its monthly administrative charge goes up in November. None of this is a reason not to switch. It’s a reason to compare the first year, not just the plan price.

4. Prepaid or Postpaid?

Switching is a good moment to ask whether you need a postpaid plan at all. The difference is simpler than the marketing makes it sound, and the FCC’s unlocking guide defines both:

The FCC adds that postpaid plans may include a contract and an early termination fee, which is exactly the kind of thing that makes the next switch harder. Prepaid is a billing model, not a downgrade. US Mobile’s plans are prepaid, with no contract. If you want the mechanics, here’s how prepaid cell phone plans work, and our best prepaid phone plans roundup compares the options.

5. Is There Coverage Where I Live?

Probably the most important question, and the one people check least carefully. Start with each carrier’s own coverage map. Look up your home, your workplace and the roads in between, not just your ZIP code. Then sanity-check the maps against independent results from Ookla’s Speedtest reports and Opensignal, and ask the neighbors. A friend who’s had the same carrier for two years in your building knows more than any map.

We don’t rate coverage ourselves, and you shouldn’t take a carrier’s word for it either, including ours. US Mobile gives every line access to all three major US wireless networks: you check your address on its networks page, pick a network at signup, and can move the line to a different network later from your dashboard. If you want more than one network on the same phone, the Multi-Network add-on costs $10/mo per line ($7.50/mo on annual plans).

The easiest test is a real one. New US Mobile customers who transfer one number get a 30-day free trial with 30GB on select networks. Use it at home, at work and on the commute before you commit.

6. Which Plan Should I Switch To?

This is the reason most people switch in the first place, so it pays to be a little ruthless. Start with your last three bills: how much data did you actually use? It’s easy to pay for a premium unlimited plan and use a fraction of it. It’s just as easy to think you’re a light user until a road trip proves otherwise.

Then compare the real cost. That means taxes, the carrier’s own monthly fee, activation and whether the price needs AutoPay. And read what “unlimited” means on each plan. AT&T Value 2.0, for example, is $50/mo for one line with AutoPay before taxes, and only 5GB of that data is full speed. Our best unlimited data plan roundup lists each plan’s caps, and cheapest unlimited data plans compares their first-year costs.

If you barely use data, you may not need unlimited at all. US Mobile Light is $10/mo for 2GB, or $96/yr ($8/mo), with taxes and fees included. You can even build a plan around talk or text alone: unlimited texts only is $6/mo, unlimited minutes only $8/mo. Here’s how to build a cheap cell phone plan from the pieces you use.

How much switching can save

Same-tier comparisons only: entry unlimited against entry unlimited, premium against premium. Big 3 prices are their single-line AutoPay rates, the cheapest price they advertise. US Mobile prices are the regular monthly rate, no promo code.

T-Mobile shows Essentials Saver 2.0 only for one or two lines. Switching a whole household? Big 3 prices drop per line as you add people, and US Mobile Unlimited plans don’t, so run the numbers in our best family phone plan guide. For every carrier side by side, see AT&T vs Verizon vs T-Mobile.

Which Switch Is Right for You?

• You’re on Big 3 entry unlimited and want the same for less: US Mobile Unlimited Starter at $25/mo, taxes and fees included, against $50/mo to $65/mo with AutoPay plus taxes at the Big 3.
• You want priority data and roaming abroad: Unlimited Premium at $44/mo, or $390/yr ($32.50/mo).
• You barely use data: Light at $10/mo for 2GB, or By the Gig from $15/mo. Our cheap phone plans roundup covers the low end across carriers.
• You still owe on your phone: pay it off or wait out the term first, then ask for the unlock. Porting can’t be refused, but a locked phone won’t come with you.
• You’re moving a couple or a family: see best cell phone plans for 2 lines or the best family phone plan.
• You haven’t picked a carrier yet: start with our best cell phone plans roundup.

How We Researched This Guide

US Mobile wrote this guide, and it’s one of the carriers in it. The rules on porting and unlocking come from the FCC’s consumer guides on keeping your number and cell phone unlocking. The transfer PIN steps come from Verizon, AT&T and T-Mobile‘s own help pages. We read all of them on October 20, 2026.

Every price and fee was read on the carrier’s own plan pages or FCC Broadband Facts labels on October 20, 2026. Prices are for one line; Big 3 prices are with AutoPay unless we say otherwise, and “/mo” on a yearly plan is the yearly price divided by 12. Where a carrier doesn’t publish something, we say “Carrier does not say” rather than guess. Savings comparisons match tiers (entry with entry, premium with premium). We don’t rate network speed or coverage ourselves; for that, see Ookla and Opensignal.