My iPhone reset and won't let me into the phone without a Wi-Fi password, but it says the Wi-Fi password is wrong but it's not

I have an iPhone 6, and it just randomly reset for no reason and the home screen says "hola" and hello in a bunch of different languages, and when I unlock it, it goes straight to this screen where it says "choose a Wi-Fi network" and every time I try to type in the Wi-Fi password, it says it's the wrong password but it's not! I've tried connecting to multiple different Wi-Fi networks and it keeps saying that it's the wrong password, but it's the right password. I even tried free Wi-Fi networks but that doesn't work either! And there's no option to skip the step to connect to Wi-Fi. Anyone know what is wrong with my phone or how to fix it?

EarPods aren't working?

I have the iPhone 7 and of course it came with the earpods with lightning connectors, the first day I had my phone the earphones were fine, now for the microphone part, when I press down the music plays and pauses, when I press down to lower the music it works but it never works when I wanna turn the volume up. I checked the port in my phone and checked my EarPods

Dropped my iPhone into water and it's still working, do I need to worry?

I dropped my iPhone 6S in about 2 inches of water earlier today. I pulled it out within 3 seconds and immediately turned it off and put it in a bowl of rice. I just turned it on and it works perfectly fine. The speakers sound normal, the charging port works, the headphone jack works, and there's no physical water damage. I took out the SIM tray to check if the water sensor was red (indicating water damage) and it was white like it should be.
Is the water sensor a full indicator of water damage, or is it possible that there's damage even if it's white?
Should I take it into Apple so they can check for water damage?

How do I change my AT&T cell phone number?

I have an iPhone and I would like to change my phone number. I'm on a family plan with my family, I know the fee is $36. I looked it up and it gave a few steps and to log back in with my new phone number. My issue is if it's not the only cell on the plan do I still use the old number or the main number on the account.

Also it doesn't give too much detail at syncing my iPhone to iTunes. What does that do? On a different site it says it sync your voicemails Bt i don't know abt that. Just need my number changed. I thought I could call in to change but I didn't see anything abt that online plus with my iPhone not sure if I can.