What should I do if a phone battery looks swollen?

Stop using and charging the phone. Do not puncture, bend, press, or open a lithium-ion battery. Take it to a service point that handles damaged batteries.

Should I put a wet phone in rice?

No. Power it down, do not charge it, and let a technician check it. Rice does not dry the inside of a phone and can add dust.

Is a factory reset the first fix for a slow phone?

No. Check heat, free storage, and a recent update first. Back up photos and accounts before any step that can erase the phone.

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Safety

If a battery is swollen, leaking, smoking, or extremely hot, stop using and charging the phone. Do not puncture, bend, or open a lithium-ion battery. If a phone was submerged, do not charge it until it has been checked. Rice is not a repair. A factory reset is not the first fix. Back up important data before any step that can erase the phone.