Buy a new phone or try to fix my current one?

A few weeks ago I dropped my iPhone 6s (owned for less than 9 months) in the toilet at a buddy's house. I dried it off as quick as I could but some damage was already done. At this current moment the volume up button and volume down button both turn down the volume. My service goes in and out and my battery drains faster than usual. Now I'm just trying to figure out what to do. Is it possible to buy the same phone (paid for in full)? How would that affect my current contract/plan? I would be willing to pay for a new phone if the hassle of fixing my current one is not worth it.

I'm assuming you did not purchase insurance with your phone?
Buying a new phone shouldn't affect your plan - but if your contract is not up (likely wouldn't be after just 9 months) then you probably will have to pay in full.

Honestly I would fix your current phone - it would be cheaper - and if I were you, I would get insurance on your next phone.