No, it definitely does not charge without a charger.
In fact, it runs out of battery without one- like all phones.
Assuming the Samsung charger is a micro USB, yes you can use the Samsung charger for the HTC One.
yes
yes
Yes we can charge it
you can not charge it without a charger it will die out without one
The charger itself should be compatible - the cord will not be.
the point of a charger is to charge the product
u can't, u have to have a CHARGER to CHARGE something
There is no safe way to charge a phone without a charger made specifically for that phone/battery
it depends on which type like Sony , Samsung you can charge it with a USB cord
It should function the same way even when plugged in. Does your charger not charge strong enough? If it's a third-party charger (not one that came with your Samsung), then it might not provide enough power for you to use the phone and charge at the same time.
Yes, you can charge an IG phone with a Samsung charger.