Step-by-step troubleshooting guides for iPhone problems, from charging and battery to iOS updates.
Where a procedure differs between iOS versions or iPhone models, the guide says which version it was checked against. Start from the area that matches your symptom.
Your iPhone vibrates for calls but the display stays black. Here is what that combination tells you, the restart sequence to try first, and how to tell a software freeze from a failed screen.
An iPhone screen that flickers after an iOS update is often a software glitch you can clear with a force restart or Reset All Settings. Here is how to tell when the display itself is failing.
iPhone touch screen not working? Take off the case and protector, force restart the phone, and know when to book service. Apple's own steps, in order.
Samsung Galaxy phones running Android with One UI.
View Samsung Galaxy guidesGuidance that applies across Android phones, with manufacturer differences called out.
View Android guides