So as of April 2019 what compatible wireless router is good for Fusion IP Broadband Residential X2 ? I would like a single box if possible, I don't want a separate wireless router.
Second question, If AT&T is the only wireless modem that works with Sonic, can I buy a used one from ebay to avoid the rental fee?
For our "IP Broadband" services, which use the AT&T Uverse network - AT&T requires the use of the equipment they supply, which is configured and deployed by their technician. They tie this down by using 802.1X port-based network access control - basically a certificate based authentication that's baked into the equipment they supply for that specific circuit. So, for IP Broadband you are limited to the AT&T-supplied equipment - alternative equipment simply won't be able to authenticate.