Yes, you can use OpenDNS with T-Mobile Internet, but it’s a bit limited. T-Mobile uses a shared network structure (CGNAT), so while you can change DNS settings on your own router or devices, OpenDNS custom features like filtering or stats may not work fully.
The simplest way is to connect a separate router to your T-Mobile gateway, set OpenDNS as the primary DNS there, and route all traffic through it. It works fine for basic DNS resolution, but custom OpenDNS dashboards and IP‑based controls might not update correctly because of T-Mobile’s network setup.
