What Does "Unlocked" Mean on a Phone?

If you've shopped for a phone online, you've seen the word "unlocked" everywhere. It sounds simple, but it trips people up. Here's what it means, why it matters, and what to check before you buy.

What an unlocked phone is

An unlocked phone isn't tied to a single carrier. You can put in a SIM card (or set up an eSIM) from the carrier you choose, and the phone will connect to that network.

A locked phone is the opposite. It's set up to work only with the carrier that sold it, usually until a payment plan is finished or a set period has passed.

Why people choose unlocked phones

• Freedom to switch carriers. If you find a better plan, you can move without buying a new phone.
• Easier travel. Many unlocked phones let you use a local SIM or eSIM when you're abroad, which can cost far less than roaming.
• No carrier extras. Phones sold by carriers sometimes come with preinstalled apps you didn't ask for.
• A bigger choice when buying used. A phone that isn't locked to a carrier is easier to resell and easier to buy secondhand.

Unlocked doesn't always mean it works with every carrier

This is the part that catches people. A phone has to support the network technology your carrier uses. Two things matter most:

1. Network bands. Carriers use different radio frequencies. Most recent phones from major brands support the main US carriers, but older or imported models may not support every band.
2. eSIM or physical SIM. Some phones use only a physical SIM, some support both, and some newer models are eSIM only in certain regions. Check what your carrier supports and what the phone needs.

The safest approach is to give the exact model number and your carrier to the seller and ask them to confirm it's a match. If you're buying from us, send us a message and we'll check.

How to check whether a phone is unlocked

• Ask the seller in writing. A clear answer is a good sign. A vague one isn't.
• Try a SIM from another carrier. If the phone accepts it and you can make a call, it's unlocked.
• Check the settings. On many phones, the SIM or network settings show a lock status. The exact wording varies by brand and software version.

Two warnings when buying used

Make sure the phone is paid off. A phone that's still on a payment plan may be locked or reported unpaid by the carrier. Ask the seller whether it's fully paid and unlocked.

Check that it hasn't been reported lost or stolen. A phone can be blocked by carriers if it's been reported, and it may not work on any network. Ask for the IMEI number (you can find it by dialing *#06# on most phones) and check it before you pay.

The short version

An unlocked phone gives you the freedom to choose your carrier. Before you buy, confirm three things: that it's really unlocked, that it works with your carrier's network, and that it isn't blocked or unpaid. Do that and you'll avoid most of the surprises.

Ready to look? Browse unlocked iPhones, Samsung Galaxy phones or Google Pixel phones, or ask us about a model.