Why doesn't my iPhone 6 connect to Wi-Fi?

So when I connect to the Wi-Fi in my house it automatically turns off and uses data if I go on safari, on Netflix, and even Instagram. So I decided to try it on my friends phone & when I tried use them on her phone, the Wi-Fi stays on and it doesn't turn off and use data. Also, the Wi-Fi isn't bad where I'm using it, on my phone it has 1 bar but on my friends phone it has 3. So I don't know what the problem is and why it isn't working.

Try hard reset it.

Yes hard reset usually works most of the time. If it doesn't take it to apple.

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