This app was mentioned in 10 comments, with an average of 2.20 upvotes
Only one I have been able to find that is compatible with the G3 is this one, which is quite frankly hideous https://play.google.com/store/apps/details?id=com.adi.remote.phone
Wish the Peel or WatchOn apps would work with the G3. Even got an APK of Peel but it wouldn't work with my TV (haven't been able to test it on anything else).
The app I use is Smart TV Remote. It connects to your TV through your wifi network instead of using IR.
You'll still have to manually turn on your TV if you turn it off as it won't be on your network when it's off.
https://play.google.com/store/apps/details?id=com.adi.remote.phone
I use this one. Although it's got ads, you can remove them with a paid option in the app itself. Works fine with my Samsung TV.
Smart Remote (Android) https://play.google.com/store/apps/details?id=com.adi.remote.phone&hl=en_US&gl=US
Try this:
https://play.google.com/store/apps/details?id=com.adi.remote.phone
There are also other remotes:
https://play.google.com/store/search?q=samsung+remote&c=apps
This is the one: https://play.google.com/store/apps/details?id=com.adi.remote.phone