Plain-English iPhone repair and buying glossary.
Use this glossary when repair shops, product listings, or troubleshooting guides use terms that are easy to misunderstand.
Activation Lock
A security feature tied to Apple ID. Do not buy a used iPhone that cannot be removed from the prior owner’s account.
Battery Health
An estimate of maximum battery capacity and performance. Low health can cause shorter life, slowdowns, or shutdowns.
Carrier Lock
A phone may be limited to a specific carrier. Confirm unlock status before buying used or switching networks.
iCloud Photos
A sync feature that can make photos appear on multiple devices. It is not the same as a simple offline backup.
MagSafe
Apple’s magnetic accessory system for charging, stands, wallets, mounts, and cases on supported iPhone models.
USB-C Power Delivery
A charging standard that helps compatible chargers and devices negotiate faster, safer charging levels.
Use a decision tool before making a repair or buying decision.
Glossary terms help, but your device condition, data risk, and budget matter most.