Why is my iPhone 5 acting weird?

My iPhone 5 is acting completely strange, and I don't know what to do. First it started off like this, I would open an app and it would close immediately. It was giving me warnings saying "Low Storage" etc do I deleted some apps and photos, BUT STILL it was acting strange, it started to get worse. Now it's telling me all of my photos are deleted and al of my messages and contacts are deleted too, but yet it's telling me I still don't have enough storage. I don't have any apps open, and my phone shouldn t be currupted since I take pretty decent care of it. I honestly need help.

My iPhone 6 with water damage needs to be sent to Asurion but it is jailbroken?

I dropped it in the river today, and it is jailbroken. I went to Verizon and they said that the new iPhone will be delivered tomorrow from Asurion, but I need to send the broken iPhone to Asurion where they might be able to fix it and sell it.
The issue is that they don't cover jailbroken devices, so if I send it back, and they fix it and see that it is jailbroken, I will be screwed with a $500 fine (at least).
So can I do to make sure they can't fix it? Could I make it unfixable by submerging it in water for a long time?

How to fix this iPhone problem?

One of my contacts use to have an iPhone but upgraded to a different phone and charged his number over so when ever I try to message him It sends to his iMessage and because it send I can't send it as a text so I can't contact them

How to set up an iPhone 6 again?

I just got another phone and I already programmed it but not all of my data from my other phone transferred so how do you set it up again as a new phone?