Screen replacement
Cracked glass, dead touch, lines across the display.
Check Settings → Battery → Battery Health. If it's under 80%, that's your answer — the phone will be shutting down early, throttling itself, and dying in the afternoon.
It's the cheapest thing you can do to make a phone you otherwise like feel new again, and it's a far better use of your money than upgrading a handset that's fine apart from the battery.
A battery that's swelling pushes the screen away from the frame. You'll see a thin gap along one edge, or the display sitting slightly proud. Stop charging it and bring it down — a swollen cell can vent, and it's putting pressure on the board in the meantime.
This isn't us being dramatic to get you through the door. It's the one battery symptom we'd genuinely rather you didn't sit on.
iOS shows a battery service notice after any battery Apple's own tooling didn't pair — including genuine cells. It doesn't affect how the phone runs or how long the battery lasts. We'll show you exactly what you'll see so it's not a surprise.
Usually, yes. If everything else about the phone is fine, a battery is a fraction of a new handset. If the phone has other problems we'll say so rather than take the money.
Cracked glass, dead touch, lines across the display.
Cable only works at one angle, or not at all.
Rear glass cracked. Done with a laser, not a chisel.
Dead phone, board-level diagnosis, data first.