Selling Unlocked vs Carrier Phones on eBay, and How to Do IMEI Checks

When you resell phones, most expensive mistakes come down to one thing: the phone isn’t what you, or the buyer, thought it was. It’s still locked to a carrier, still owes money on a payment plan, is reported lost, or is still tied to the previous owner’s account. This guide explains each status and how to check it before money changes hands.

Unlocked vs carrier-locked: why it matters

An unlocked phone works with any compatible carrier. A carrier-locked phone only works with the carrier that sold it until that carrier unlocks it.

For sellers, unlocked phones usually:

• sell to a bigger pool of buyers (any carrier, travellers, international buyers)
• get higher prices and fewer “doesn’t work with my SIM” returns
• are simpler to describe

A locked phone isn’t worthless. Plenty of buyers on that carrier want one. But the listing has to say clearly which carrier it’s locked to, and you should expect to price below unlocked comps.

Carriers each have their own unlock rules, usually based on the device being fully paid off and active on the account for a minimum period. If you’re buying phones to resell, it’s often cheaper to ask the original owner to request the unlock before you buy than to deal with it afterwards.

The four things to check on every phone

1. IMEI / serial number

Every phone has an IMEI (dual-SIM and eSIM phones may have two). Dial *#06# to show it, and make sure it matches the number in Settings and on the SIM tray or box if there is one. A mismatch is a red flag.

2. Blacklist (lost/stolen) status

Carriers share a database of phones reported lost or stolen, or with unpaid bills. A blacklisted phone may be blocked from connecting to networks. Before you buy or list, run the IMEI through a blacklist check. Many carriers offer a free device compatibility checker on their website, and there are paid third-party checkers that also report carrier lock and financing status.

3. Financing / payment plan

A phone that’s still on a payment plan can be blacklisted later if the original owner stops paying, even after you’ve sold it. Some third-party IMEI checks report this. When the report is unclear, treat it as a risk and price accordingly, or pass.

4. Activation lock (iCloud / Google FRP / Samsung account)

This is the most common phone problem on resale marketplaces. Find My (iPhone) and Factory Reset Protection (Android) stop a phone from being set up by anyone except the original account holder, even after a factory reset. Before you list:

• On iPhone, make sure the phone has been removed from the previous owner’s Apple ID and Find My is off.
• On Android, make sure all Google accounts are removed (Settings → Accounts) before the factory reset. On Samsung, also remove the Samsung account.
• After resetting, go through the setup screens far enough to confirm that no account lock appears.

Describing carrier status in your listing

Put the facts in the title and the item specifics, not just the description:

• Title example: “Samsung Galaxy S23 128GB Phantom Black Unlocked, Excellent, Battery 91%”
• Item specifics: Network = Unlocked (or the specific carrier), Lock Status = Network Unlocked / Factory Unlocked
• Description: “Clean IMEI (not blacklisted), no account lock, factory reset and ready to activate.”

Being clear here protects you. Most “item not as described” claims on phones come from carrier and lock confusion. A high INAD rate can cost you an extra 5% fee on every sale in that category (see eBay fees for cell phones).

Should you include the IMEI in the listing?

It’s a judgement call. Showing part of the IMEI, or offering it on request, reassures buyers who want to run their own checks. Some sellers prefer not to publish the full number. Either way, record the IMEI of every phone you ship. If a buyer returns a different phone, that’s your evidence.

Quick pre-listing checklist

• IMEI matches across the dialer, Settings and the tray/box
• Blacklist check: clean
• Carrier lock status confirmed (test a SIM from another carrier if you can)
• All accounts removed; activation lock confirmed off after reset
• IMEI recorded in your inventory sheet
• Carrier status in the title and item specifics