My volume bar is gone on my iPhone

For the last week my volume bar has disappeared when I press the button. The speaker shows up but nothing happens. It won't play music or YouTube and the volume bar is gone there to. It doesn't work on games either. Today I was playing a game and I heard sound and it worked for a split second and then it stopped. It did that twice. Why does it do this and how can I fix it? I have an iPhone 4

My iPhone power button is stuck and I have a full year warranty?

Ok, so my iPhones power button has been stuck for awhile now and need to get a new one I still have my warranty but can't find the paper with all my contract stuff the day I got my iPhone can he look at like a serial number or something on my phone that shows I still have my warranty?

Tumblr app for iPhone 4 not working

I went to the app store about a week ago and my Tumblr app needed an update so I updated it. Now everytime I click on it it just exits out back to my home screen. I left it alone for a while because I thought it was just my phone acting up but over the course of the week I kept trying to click it day after day and it won't open, just exits out to my homescreen. I suspect it's because this update of Tumblr was created for the iOS 6.1.3 software update for the iPhone but I can't get it because I need 2.7 GB of available storage but I refuse to delete any apps or pictures or music for a software update I don't care to download in the first place. I simply made the mistake of updating my Tumblr app and now I can't access it. Right now my softward is not 6.1.3 but 5.0.1 and I'd like to keep it this way. But I would also like my Tumblr app back. I do not like the safari version of Tumblr either so I don't use it. Is there a way to either get my old update of Tumblr back or something? If you could help me that'd be a tremondous help. I just want my Tumblr app back and working.

How to get album art to show up on your Iphone?

For many of my songs I add album art manually by clicking 'get info' and then changing the album art. While the artwork shows up in the information menu, when I pull up the song on my Iphone, the picture is still that blank grey space. How can I make it so that my album artwork actually shows up on my Iphone as well?

This might seem a bit petty, but I guess I'm a perfectionist and I get bothered when all I see is that blank space.

I put my iPhone in rice after water damage but it's still overheating?

My iPhone 4 was only submerged in the water for a matter of seconds, but I dried it up as much as I could and then took it home and put it in a bag of dry rice for 3 days. I then turned it on and put it on charge, but it'll only charge up to 11% before overheating.

If I put the phone back in the bag of rice for another couple of days do you think this issue will be solved?

Why does my iPhone lag so much?

It's really bad when I text people for some reason? It will just freeze for like 30 seconds sometimes.

I always close background apps, close tabs in safari, etc. I delete text messages all the time, and I have like 4 GB of apps, my phone is 16 GB.

It's so annoying, it sometimes doesn't even notify me I have a new text. How do I fix this? It just started doing this about 3 months ago. It's an iPhone 4S.

Added (1). I just decided to backup my phone and completely reset it, I hope this works. It's really pissing me off.