The phone is stuck on the startup splash screen after two factory resets. When I started the phone for the first time the system data was fragmenting the internal card to 13 gigs instead of Android's 2 gig specification for marshmallow 6.0. Tech support did not acknowledge the corrupt card. I can't keep factory resetting, eventually the internal SD card will stop working altogether. Reading the previous reviews, RMA is just going to land me a replacement phone that was "repaired" and passed for resale by ZTE. I did notice the serial label on the back of the phone was dirty, I can't believe ZTE sells used phones like this.