The foldable ZTE Axon M (Z999) handset surfaced on FCC yesterday, about one week prior to its alleged launch date. The certification documents reveal LTE, Bluetooth, NFC, and WiFi dual-band connectivity, as well as a foldable case that measures 5.9 x 5.51 inches when open.
https://www.notebookcheck.net/Foldable-smartphone-ZTE-Axon-M-Z999-hits-FCC.257812.0.html