Micro SD card slot supports up to 32GB (micoSD memory card NOT included) SMS, USSD, Phonebook support Built-in antenna, Antenna auto-detect

24X8 DOCSIS 3.0 cable modem plus a built-in AC1900 Dual Band (2.4GHz and 5GHz) WiFi Gigabit Router with four Gigabit (GigE) Ethernet ports, a firewall, and more. This product is approved by Comcast Xfinity and recommended for service speeds up to 650 Mbps, and is certified by Cox for service speeds up to Ultimate. A Broadcom cable modem chipset provides security from Denial of Service attacks. Requires cable Internet service from Comcast Xfinity and Cox and is approved for use in the modem ownership programs that save rental fees of up to 132 per year. (Model MG7700 has no phone jack and will not work with Xfinity Voice or Cox Phone. No cable modem is compatible with fiber optic, DSL, or satellite services from Verizon, AT&T, CenturyLink, Frontier, and others.) Built-in high-speed WiFi router with AC1900 WiFi and Power Boost provides Internet access for WiFi devices including smartphones, notebooks, tablets, game stations, HDTVs, Amazon Echo, Google Home, Chromecast, Roku, Amazon Fire TV, and AppleTV. Four 10/100/1000 Gigabit Ethernet LAN ports provide wired connections to Windows and Mac computers, HDTVs, game stations, streaming TV devices, and other Ethernet-capable devices.