Used Phone Buying Checklist: How Shops Avoid Stolen or Blacklisted Phones

Buying used phones from walk-in sellers is one of the most profitable parts of a phone shop — and the riskiest. A phone that turns out to be stolen, blacklisted, or locked to someone else's account can't be resold, can be confiscated, and can damage your shop's reputation. This checklist covers what to verify before you pay, and what to record afterwards.

1. Match the IMEI everywhere

The IMEI is the phone's unique identity number. Get it three ways and make sure they match:

• From the phone itself: dial *#06#, or look in Settings → About phone.
• From the hardware: on many phones it's printed on the SIM tray or the back.
• From the box or purchase receipt, if the seller has them.

A mismatch — or a seller who can't show the IMEI — is a strong reason to walk away. Dual-SIM phones have two IMEIs; record both.

2. Check whether the phone is reported lost or stolen

When a phone is reported stolen, operators can add its IMEI to block lists so it no longer works on mobile networks. Check before buying:

• GSMA Device Check (devicecheck.gsma.com): an international check against the GSMA block list, used by many traders. Check its current access terms.
• Your country's registry, where one exists — for example India's Sanchar Saathi / CEIR or Pakistan's PTA DIRBS device check.
• The original carrier, for carrier-locked phones in countries where carriers sell handsets.

A clean result means the phone isn't currently flagged — not a guarantee it never will be. That's why the records in step 5 matter.

3. Make sure the phone isn't locked to the seller's account

• iPhone: Find My / Activation Lock must be turned off and the phone signed out of the seller's Apple ID. A phone with Activation Lock on can't be set up by the next owner.
• Android: the seller must remove their Google account before factory reset, or Factory Reset Protection will ask for their password after the reset.
• Financing or carrier locks: phones still being paid off can be locked by the lender or carrier. Ask directly, and check with the carrier where possible.

Ideally, have the seller sign out and reset the phone in front of you.

4. Test the hardware

Insert your own SIM and make a call, check the screen for dead pixels and burn-in, test cameras, speakers, microphone, charging port, fingerprint or face unlock, and battery health where the phone shows it. Note any faults — they affect both your offer and your resale price.

5. Record the seller and the device

Good records protect your shop if a phone is later reported stolen. For every purchase, keep:

• The seller's full name, phone number and government ID — ideally with a photo of the ID.
• The IMEI(s), brand, model, storage, colour and condition notes.
• The price paid, date and which staff member made the purchase.
• A signed declaration that the seller owns the phone and has the right to sell it.

Follow the data-protection rules that apply where you operate, and limit who on your staff can see ID images.

6. Track the phone until it's resold

Keep the used phone in stock under its own IMEI, with its purchase cost, so you know your profit when it sells and can trace it instantly if anyone asks. See what to track when buying and selling used phones.

Doing it in software

MobiPOS's used-device module records the seller's details and ID, the IMEI and condition, evidence files and a seller declaration on every purchase, keeps ID images visible only to staff you allow, and tracks each phone through to resale. MobiPOS is free for lifetime in every country.