Can I charge an iPhone (4) without a charger?

I left my charger at my grandma's house and now it's 10% I don't have a USB charger so yeah. My step dad has an HTC, will the charger do it? And my step sister has a Samsung phone, will that charger do?

No.iPhones have special chargers; that are MADE for Apple devices. I suggest you just charge your phone at a friend's house who has a charger for Apple devices.

Well, if it had a removable battery, could could take it out, cut apart one of the other cables, and put the positive and negative terminals on the actual battery, since they all use the same voltage. But it doesn't, so your kinda screwed… If either had an ipod cord, it'd work as its the same thing

Nope & nope. The iPhones are made to charge using Apple's 30-pin connector which is unique to Apple devices. Not HTC, not Samsung (though that didn't stop them from making one for the Galaxy Tab 10.1)

If you have the cable you can recharge it through any computer USB.

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