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> Please do not plug your $600~ smartphone into a $1~ charger. That's just asking for trouble.

Why? Do you think they'll fight because they don't make the same amount of money?

A 3 to 5 volt booster is not easily going to damage a phone.

But fine, get a $5 model from a reputable brand.

You can also get an entire phone for $10. It will even have a screen!

Don't spend $50 on a piece of garbage.

> Please do not plug your $600~ smartphone into a $1~ charger. That's just asking for trouble.

You're assuming that supplying 5v to a cellphone through a 5v USB charger is something that damages the phone.