Useful Apps function properly up to the Skype telephony. The conversation is good but you should then but Skype can open otherwise it crashes, or write properly, you can then no longer. Whatsapp is going well, the camera takes reasonably good pictures and the supplied headset has a good reception quality. The display has until now, thanks to Gorilla Glass, yet no scratches.
I recommend you the following apps: flashlight, file manager & Chrome (Google Browser).
MfG