What should I check before buying a used phone for new service?
Answer
Before buying a used phone for new service, confirm it is carrier-unlocked, fully paid off, not reported lost or stolen, and in acceptable battery condition—especially on iPhone.
Before you start: stop right away if…
- Do not buy unlock services from random websites or callers promising to bypass carrier locks for a fee.
Follow these steps
Require an unlocked listing
Only consider phones advertised as unlocked. Avoid listings that say locked to AT&T, Verizon, Cricket, or another carrier unless that is exactly the service you will keep using.
You should see: You narrow choices to phones that can usually accept a new SIM or eSIM.
Confirm the phone is paid off and not blacklisted
Ask whether the phone is fully paid off and not reported lost or stolen. If possible, check the IMEI with the seller’s info using reputable carrier or device-status tools before you pay.
You should see: You have reasonable confidence the device can be activated and is not blocked.
Check battery health on used iPhones
On a used iPhone, open Settings > Battery > Battery Health & Charging (wording may vary by iOS version) and note Maximum Capacity and any service messages before buying.
You should see: You know whether the battery is acceptable or likely needs service soon.
Test calls, Wi-Fi, and SIM/eSIM readiness
If you can inspect in person, power on the phone, confirm it is not Activation Locked to someone else’s Apple ID or Google account, and test Wi-Fi plus a SIM/eSIM tray or eSIM transfer path for your carrier.
You should see: The phone is free of prior-owner locks and ready for your service setup.
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Extra tips
What to look for: Listing language such as unlocked vs carrier-locked, IMEI/serial status, payoff or financed status, and battery health on iPhone.
Before you change anything: Decide which carrier or service you will use. Ask the seller for the full IMEI before paying when buying used. Prefer meeting places or payment methods with buyer protection. Never share banking codes with sellers who pressure you to “verify” remotely.