I guess it depends what features of MediaPortal you want to access, and what's available for your phone and tv. There is an Android app MPTvScheduler, which will run on your android phone (and maybe an android tv, idk), which will let you access the TV features of MediaPortal. I've never used it personally, but it has a pretty good rating in the Play store. Another option is Kodi, if that's available for your smart tv, which can also connect to MediaPortal's TV server. So you have a couple of possibilities to look at.
Regeszter MPTvScheduler does work on android TV, but it could be much better.
MPTvScheduler work great on phones and tablets. He did a wonderful job for the portable devices.
If someone could make a smart TV version of MP that works like MP1 on PC with all the plug-in that would be great!!!
Team-Mediaportal need a Smart TV app to kick Kodi's A**.