While many models do work with HID keyboards and the Logitech k400, it starts to fall apart pretty quickly as you find apps may or may not support keyboards. It's very hard on most to understand that Samsung did not write for example the YouTube app and has little leverage to get Google to fix it.
This is no PC. Not even close. As to the phone app, the app seems to come and go out and in of favor.
What's so smart about these smart TVs is a good question. But the smart TV has a glaring issue. Folk want it to work as good as say a PC and keyboard. Forget about apps and browsers for a moment. But we're not there yet.
Advice? Turn off the smart TV (smart hub) and use other boxes to get it smarter. Besides Smart Hub is not about you. (what you say?) It's all about content and advertising delivery. Samsung has never hid that fact.
So I bought a Samsung TV #UN46EH5300, and a Samsung Smart Phone a Galaxy Note 3, and a small Dell Laptop Inspiron 3138, high speed internet and wireless router ... because all of this smart stuff was supposed to talk to eachother. After countless man-hours of tech support and dropped calls ... the conclusion is that none of this stuff is compatible with eachother, and that the multiple videos showing this stuff all working together in 5 minutes must be made-up phoney baloney.
I was told by one agent that the keyboard just had to be hid compliant (which it is ) and it should work , but then he couldn't get it to work. I've been told that the next series of models up from mine will work, but not my low-end unit. I'm just scratching my head , are you guys serious that you could expect someone to say , try to type info into a YouTube address with the clunky TV remote fishing for each letter ...??? I have seen here on this forum ( cnet ) that some folks have had luck getting an outboard wireless keyboard a Logitech 400 and it is working for them. Then on the all-share mirror function I was told that my model just didn't come with that feature. I was also told that there are no apps for my Samsung phone that incorporate a keypad to work with my Samsung TV. Looking for any and all info. that could be helpful , especially any sucess stories how you got around these major obstacles and operational blunders in just trying to USE your "Smart" TV. Thanks, Dan