Phone chargers with USB port are USB power supplies with some extra functions.
They are required to adhere to USB specifications.
So yes that phone charger should work.
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I do not think that is a good idea. A usb 2.0 ports is supposed to provide 500mA, a USB 3.x about 900 mA. Many mainboards supply more power, because people like to plug in USB only hard drives which require more, at start-up at least. In the long run you might actually damage the usb ports of your server, a Pi 3 needs around 400mA plus 350 for the FA stick.
Edit: It is not as bad as I thought, rasperrypi.org mentioned 700-1000mA, but that seems to be in “desktop”-mode usage scenarios.
Very late update but better late than never.
I purchased a new power supply for my pi and since then I had no issue at all. So the problem really was insufficient power.
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