Safety Before Opening a Phone — Smartphone Academy

Prepare data, power, battery, workspace and emergency limits before heat or tools touch the device.

Core ideas

Back up irreplaceable data and remove accounts or enable the manufacturer repair mode when available.
Power the phone off, remove the SIM tray when the model guide requires it, and follow the guide’s battery state recommendation.
Stop immediately for swelling, hissing, unusual heat, chemical smell, torn battery foil or liquid damage.

Decision rule

A swollen or physically damaged lithium-ion battery is not a beginner repair; isolate the device and use a qualified service route.

Apply it on your phone

Write a go/no-go checklist that names the exact conditions that cancel the repair.

Official sources