How good is the camera on the iPhone 6s?

Lol The iPhone 7 is too damn expensive for me so I want to get an iPhone 6 but I need to know how good is the camera. (I know nothing much about phones) It's why I'm asking here.

Speakers sound blown out when I play my music on the Aux cord?

So starting today I put my Aux cord into my iPhone 6 to connect to my Pontiac Torrent to play music, and the audio was absolute garbage! It sounded like my speakers were blown out, which scared me. But I went to my radio to see if it did the same and it was fine! I thought it was just the aux cord breaking, but I bought a new one after work and it didn't help at all. What is wrong with my auxiliary port?

What Phone Should I Upgrade To?

I have a 5 year old iPhone 4S that doesn't work anymore. I plan on upgrading my phone and I was wondering what phone I should upgrade to? I need all factors considered in answers.

IPhone real or fake?

I recently bought an iPhone 6s and the serial number inside the "about" section did not have any google results pop up. It just had no search results. I'm just wondering what does that mean