How to use my iphone 5 as a remote for a toshiba hdtv?

What app to download please let me know also i have cablevision

Download the "remoteappletotvthingappthatimadeappthat… App i made it and its free.

P.S. I'm in your house.

If it is a network connected smart TV, see if Toshiba has an app.

Otherwise you use a generic IR remote app and IR blaster.

Same for your provider, their app, or IR.