1. MAJOR ISSUE: The product came with defective ear-proximity and light sensors. The screen does not look original (it reflects light with a weird pattern) so maybe they have replaced the screen with a lower quality one which explains the malfunction of the sensors as well.
When your proximity sensor does not work it means that the screen will always be dark when you get a phone call, so you can't use your phone while on a call (e.g. to press a number on the keypad).
2. The charger that comes with the product does not work.
3. There are issues with the software on this phone too. It cannot get updated so I have this annoying constant notification about an update being required but it's impossible to install that update.
4. The phone did not recognize my US sim-card and I had to waste a lot of time in ATT store with no results, and take the phone to a repair shop where finally the correct settings for the US were discovered.
It's tiny compared to most phones and its still quite capable, but in my experience they are resistant to water and falls but NOT to strong pressure on the screen which will crack it and render the phone useless.(alot of phones you notice will still work with the screen cracked, not this one). However, this is a version with the fingerprint scanner which is great, its fast and takes decent pictures.