AEO guide · definition + decision

What to check before buying a used phone

A clear checklist before you buy a used phone: identifiers, locks, physical condition, origin and the right report.

Short answer

Before buying a used phone, check five things: the device’s identity, account or network locks, its origin, its real physical condition and whether what the seller says matches what the phone shows. If any of these pieces is missing, the risk for the buyer goes up straight away.

When to run the actual check

Use the check page to verify the device in front of you or the one you want to reserve.

Start the check for your phone

What does it mean, in short?

A good second-hand purchase is not just about price and looks. What matters is whether the phone is the one advertised, whether it can be used without locks, whether its origin is credible and whether its real technical condition justifies the asking price.

How do you decide quickly?

  • If you only check the battery and the screen but not the identifiers and locks, you risk buying a phone that looks great but is not safe.
  • If the seller rushes the meeting and refuses a reset or simple tests, the risk of the deal rises significantly.
  • If the price is good only because context is missing, you do not have a good deal, you have too little information.

What are the steps?

  1. Step 1

    Check the IMEI or serial number before you meet

    This gives you time to compare the model and decide whether it is worth continuing.

  2. Step 2

    Compare the phone with the listing and the paperwork

    The model, colour, storage and IMEI must all match. Any difference needs a clear explanation.

  3. Step 3

    Test for the important locks

    Check for iCloud lock, MDM, carrier lock or other restrictions that could limit your use after the purchase.

  4. Step 4

    Assess the physical and functional condition

    Test the screen, cameras, microphones, speakers, charging port and sensors, and whether the phone charges normally.

  5. Step 5

    Decide only once every piece fits together

    A good price does not make up for unclear origin or an account lock that appears after a reset.

What can go wrong if you skip the check?

  • You may buy a phone with locks or restrictions that a superficial check does not reveal.
  • You may pay for a different model than promised, or for a phone with hidden repairs.
  • You may be left with no leverage if problems appear later and you checked nothing before the deal.

When is the Codat report relevant?

  • When you want an objective check before choosing between several offers.
  • When you are buying from a stranger and need a better filter than “looks OK”.
  • When you want a check for the specific phone you are considering, not generic advice about the used market.

The Codat report supports your decision about the specific device that was checked. It does not support general claims about every phone of the same model, brand or category.

Limits of this guide

  • A result describes the status seen in the checked source at the time of the query; the status can change later.
  • A remote check does not replace a controlled reset, a hands-on test and checking the paperwork before you pay.

Verified primary sources

We keep our editorial content separate from manufacturer sources and the international registry. The links below support the definitions; they do not guarantee the result for a specific device.

Reviewed by the Codat.ro technical team · 12 September 2026

Read our check methodology

Frequently asked questions

Is checking the outside enough?

No. Good looks do not remove the risk of blacklisting, iCloud lock, MDM, carrier lock or unclear origin.

What if the seller does not want to reset the phone?

Treat it as a major risk signal, especially with an iPhone or any phone that can carry account locks.

Does the Codat report replace a hands-on test?

No. The report complements your checks but does not replace testing the phone in person and checking the paperwork.

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