IPhone 6s battery messing up?

I've had my iPhone 6s for 2 years now and the battery has starting messing up. It'll be at for example 80 percent then just fully die, I'll put the charger in and once it starts up it says it's on 11 percent. It does this multiple times a day is there a fix for this or just go for a new phone?

What are some good free iPhone app games?

I like simulation games mostly but am open to any suggestions. Right now I have iLand which I really like. It's a farming game similar to FarmVille (according to my mom, I've never played it myself) but I've tried similar ones that I don't like as much due to waiting and lack of storage (in the game). I just installed a zoo game - I forget the name - and I'll give that a shot but looking for suggestions on any other good games/apps to use when I'm bored as hell, which is all the time, lol. Like I said I'm open to whatever but I mentioned the one(s) I have to give you a rough idea of what I like most. I like anything to do with animals, farming, and real life, but if you have suggestions that are completely different I won't mind. I prefer free apps without advertisements and ones that won't cost me later. I also like something somewhat simple as I have a hard time developing good techniques and poor comprehension skills. You could just tell me ones you personally like if you wish.

Does register mean creating an account is not free?

If I try to enter a website and it's free to download for iphone (i have Android so I can't download it.) and i create and account and it says register but there's no price said anywhere on it is it free

Should I get an iPhone 7 or 6s plus?

I'm getting a new phone on Black Friday tommorow, will be a 32GB both the 7 and the 6s plus cost about the same, I kinda want the 6s plus more because of the size but what features does the 7 have over the 6s or 6s plus seeing as the 7 is a year newer? Is it much faster or anything like that? Any features worth noting? I currently have an iPhone 16, 16gb so I kind of know what the 6 is like

Do I remove my SIM card when I trade in my phone?

So I'm with consumer cellular (a cheap prepaid phone service) so in order to get on their plan with my iPhone I had to buy a different SIM card to put in my phone for the service. I don't like the service anymore so I'm thinking of trading in my phone to either Apple or sprint and upgrading. Would they take my phone with the prepaid services SIM card or would I need to remove it?

16 gb iphone? Is it worth it ( 6s)?

Hello guys i'm thinking to get an Iphone 6s because i love it and it's less expensive from the iphone 7 or 8 or X but i'm thinking to get the 16Gb and i'm asking if someone knows is it worth it for that space or should i get a bigger Gb phone? I just want it for pictures videos not so much downlods or songs please guys a little help?