@Paramad I don't think it matters what kind of internet connection you have, however the download/upload speed will of course be limited by the external connection. One question to check is if the 3g/4g router can work in bridge mode (preferable) so you can use the Deco M9+ as router. If not, you need to turn off Wifi on the 3d/4g router and use Deco M9+ in access point mode.