Bluetooth, Wi-Fi and CarPlay are three names for one problem area: short-range radio links that break in ways the settings screen cannot explain. A device you cannot find, a connection that drops five minutes in, a car that shows nothing at all — each has a physical cause, and each is tested differently.
What this section covers:
- Bluetooth — why a pairing record exists at both ends, why the same fault appears once as "will not pair" and once as "keeps dropping", and why audio quality is limited by design rather than by your earbuds.
- Wi-Fi — separating "does not appear" from "will not join", what actually causes repeated drops, and why hotel and campus networks refuse a phone that is technically connected.
- CarPlay — wired and wireless are different links underneath, which is why "wired works, wireless does not" narrows the problem so sharply.
Start with Bluetooth keeps disconnecting? — it draws the line between a pairing fault and an interference or power-saving fault, which is the split every other article in this section builds on. For version-specific trouble after an update, see iOS 27 Bluetooth issues and CarPlay keeps disconnecting after an update.