My iphone won't connect to the Wi-Fi?

I took out my iphone 4 battery and now its charging so it won't turn off, but it won't let me switch the Wi-Fi to on, its just off the whole time

You took out the battery on your IPhone? Have fun explaining that to your service provider… Or apple.
Sometimes it won't connect to Wi-Fi if battery is low because it takes too much power. Other times its because you decided to rip out the battery on a phone that was not designed to have that happen without a factory shut down and your iphone decided to tell you its done with your sh*t.
And other times its because you really don't have an iphone and you have knock off but arent smart enough to realize that real iphones don't have removable battery packs.
Either way, I don't care.

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