This section covers Plain-language definitions for the terms that show up in every other article. Battery cycles, system data, eSIM, 5G bands, and the rest.
This section covers Plain-language definitions for the terms that show up in every other article. Battery cycles, system data, eSIM, 5G bands, and the rest.
Every term in one place — what it means, why you run into it, and the misunderstanding that usually comes with it. Where Apple publishes no figure, this page says so rather than inventing one.
Updated 2026-10-08Every Apple figure this site quotes in one place — temperatures, battery cycle ratings, storage headroom — each row labelled Apple-published or our own rule of thumb, with the support link attached.
Updated 2026-10-10WhyMyPhone reads live thermal state, CPU, battery, and storage metrics, then gives you the most likely cause plus fixes you can apply right away — with AI follow-ups when you want more precision. Rule-based diagnosis runs on-device; your data never leaves your phone.
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