Game on iPhone does stuff on my Apple Watch?

I was playing a game on my iPhone and it randomly activated my Apple Watch. It brought up the now playing thing. I would close out of it and continue playing my game, but it would keep doing it. Any reason why.

I think there's something wrong with my iPhone

I've dropped my phone a lot in the past, the screen is completely shattered and there are pieces of the screen that have fallen out. But I haven't recently (in at least the last month) dropped my phone. In the last few days my phone will randomly start playing music, from iTunes and from YouTube a few times. There's been times when I have my headphones in but when the music randomly starts playing, it plays from the speakers not the headphones and there's been one or two times when I would be talking on the phone to someone when the music will just start playing again from the speakers and not through my headphones but the person I'm speaking to can hear the music as well. This doesn't happen on my other phone and I'm not sure how to fix it, if I even can. Any ideas on what is wrong or how to fix it?

Is iPhone 6 still worth buying in 2017?

I've always wanted this phone since it came out, now that my iPhone 5 has stopped being supported with the new IOS 11, in thinking of spending the money sufficient enough for buying an iPhone 6. It doesn't have 3D Touch, (which I don't like), and it's the perfect size. All the phone after the 6S are bad in my opinion.

My iPhone broke abroad- what should I do next?

I'm studying abroad in France and my phone got water damage (I didn't swim with it but it may have been with a wet towel or something). The repair shop said that it is not repairable. My French carrier is SFR (in the USA it's Verizon but I have the SFR sim card in now). Is it possible to buy a new iPhone from them or will I have to wait until I return to the USA? Really do need a smartphone for school and communication purposes so what should I do?