iPhone glossary: important terms explained

Plain-language definitions of the terms you see when comparing and buying a like-new iPhone.

Buying and condition terms

Like-new
An inspected, fully functional iPhone sold in a clearly described cosmetic condition.
Condition grade
A grade describing visible wear and the stated battery range; it does not lower the functional standard.
Battery health
An estimate of the battery's maximum capacity compared with when it was new.
Storage
Built-in space for apps, photos and files. It cannot be expanded with a memory card.
IMEI
A unique device identifier used to identify a mobile phone.
Warranty
The stated period in which covered faults can be claimed under the published conditions.

Activation Lock
Apple protection linked to Find My. A phone must be removed from the previous owner's account before sale.
iCloud
Apple's account and cloud service for backups, photos, Find My and device synchronisation.
Face ID
Apple's facial authentication for unlocking, sign-in and compatible payments.
eSIM
A digital SIM activated by a supported mobile operator without inserting a physical card.
5G
A mobile network generation whose real speed depends on operator, coverage and tariff.
MagSafe
Apple's magnetic attachment system for compatible wireless chargers and accessories.

OLED
A display technology with individually lit pixels, strong contrast and deep blacks.
True Tone
A feature that adjusts display colour temperature to ambient light.
ProMotion
Apple's adaptive high-refresh-rate display technology on supported Pro models.
Optical zoom
Magnification produced by the camera lens rather than by cropping the image digitally.
USB-C
A reversible connector used for charging and data on newer iPhone generations.
Lightning
Apple's older reversible charging and data connector used on earlier iPhones.

Use the model specifications to understand iPhone families, the comparison tool to compare two models, or the buying guide for a step-by-step choice.