Per TCT's Internet Disclosure:

TCT requires customer to install a router when connecting to their Internet service. This provides the customer additional security and allows for IP address conservation.

You may purchase a router online or from any electronics store. TCT does not require you to have a specific brand of router, so you are free to pick one that fits your needs.

TCT also leases a router called the WiFi One. This router is managed by TCT and allows seamless updates and friendly local support.