Can I Reset My Fiber Modem

No, Never push the RESET button on any device provided by OnPoint, doing so will factory default the device and a tech will have to re configure the device to get your service back on. You can reboot (re power) devices by unplugging the power cord for 5 seconds.

Will I Need To Purchase A Router With WiFi

No, The Fiber Modem Has Built In Wifi 2G/5G