How to fix my iPhone?

I have an old iPhone 6s that hasn't been activated since the 7 came out? But I still use it sometimes and it's got a lot of information on it. I cut it on and it was asking for Wi-Fi info like it had updated or something but I set that up then it said it was activating and may take a minute then said activation error and won't do anything. How do I fix it. At least to back it up and get my stuff

I hate cellphones! Even the brand new ones are so very slow! And I can't figure out how to put an adblocker on the stupid things!

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