I'm not sure when this happened, because I didn't realize my phone wasn't automatically connecting to my home wifi until I got a warning that I had used 90% of my data. As far as I can tell, nothing specific happened to my phone that would have triggered it.
When I try to turn on my wifi in the swipe down menu, it turns a faded green, and when I go to wifi settings, it either won't let me turn on the wifi, or it'll switch to "on" but the on button stays gray.
I've tried restarting, restarting after removing the battery, resetting the router, resetting my settings, and a factory reset, but nothing's changed it. I'm hoping someone can help me - I got this phone refurbished from Verizon just a few months ago.