Stop using the device
- A swollen battery, unusual smell, smoke or severe heat is a stop-use condition.
- Do not puncture, cool with ice or open the device.
- Seek the manufacturer's or a qualified repair provider's safety instructions.
Before service
- Back up data only when the phone is safe to use.
- Check warranty and repair options with the manufacturer.
- Never surrender passwords or verification codes to an unverified contact.
Sources & verification
Last checked: . Official guidance is the primary source. Steps can differ by model, carrier and software version.
- Cooling down popup appears on Galaxy phone ↗Samsung Support · 2026-09-26 · PH2-SAMSUNG-THERMAL
- If a Charging On Hold notification appears ↗Apple Support · 2026-09-26 · PH2-APPLE-THERMAL