AT&T Phone Issues

[AFlappyChicken]

I've run into quite the issue.

Let's take it from the top. Back in Spetember (~ 10 mo. ago) I had purchased an iPhone 5S that worked flawlessly until a month ago when it was completely submurged and I was not aware of it. It was in the night so in the morning I had picked it up to use it when it felt like how my iPhone 4 died (so hot it felt like it would melt). After tinkering around with it, I had found out that the battery had leaked and gotten into the components. For the past month I have been looking at Android phones because I have been wanting to switch (I'm not here for phone reccomendations).

Anyway, I am locked into a 2-year contract on a family plan where no one is eligible for an upgrade. I've known for about 3 years that unlocked phones can be expensive, but you are able to do pretty much anything with it until a contract is signed. Listed below are some requirements that I have made.

1. Unlocked phone

2. It must replace the current phone on my line but not have anyhting like termination fees (minimal fees)

3. I would need a new SIM card

Some questions I have are:

1. If I use the AT&T BYOP page (google it), will it add another line to my existing ones?

2. Will AT&T make me fork out tons on money to upgrade (if there is any extra fees, let me know [apprx cost would be appreciated.])?

If there is any other advice you have, I'd really like to hear it! (The apple warranty is void, by the way)

Thanks,

Chicken (that's not my real name)