Can I fix these iPhone glitches?

For the past three or four days, I've been having the following problems with my iPhone 4s:
1. When I take my phone off a speaker, it seems to be stuck in the speaker audio setting. It doesn't play sound or give me any volume options. I have to put it on and take it off the speaker a few times for it to return to normal.
2. My music stops mid-song but the iPod app is still open (it doesn't crash or anything).
3. My apps have been crashing more frequently than usual.

The only reason I can think that could be causing this is that I dropped my phone about a week ago without a case and the back shattered. I wouldn't think that this would cause internal problems though. And yes, to answer your question, I have restarted the phone many times.

Is there any obvious or common issue that could be causing this?

Why does it say 'E' instead of 4G?

I have an iphone 5 by tmobile.sometimes it says 'E' at the top. I think it stands for 'edge' but i don't know what it means. What does it mean?

What should I do to solve this?

I've bought an iPhone 5 from USA on 9th Jan. And it's lock button is working partially, means I've to press it hardly then only it works, what should I do?

IPhone won't let me send pictures?

I bought a 16gb unlocked iPhone off eBay and the phone company I'm with is cellularone. The phone won't let me send pictures even tho I have the data plan, it's like the picture button in the bottom corner of a message is off. I went to the settings and went to messages and there's no text their at all

What are the different types of cameras?

I want to know the difference between all of the cameras and which one is most recommended to a amateur photographer. I have a point and shoot and an iPhone camera so disregard those… I have heard of dSLR compact medium format etc… But I don't know much about those…

Tumblr app- how to do things?

I just joined tumblr and I use mostly my iPhone for surfing the web as my computer just broke. So my questions is this: how do I change the URL of my blog and the name of it via the app? I can't find the settings anywhere. I did figure out how to change my picture so that's a plus!

Any other tips would be great as well!

Where can I get blank iPhone cases?

I want to make my own iPhone cases and I've seen people post photos of them getting theirs in but they refuse to tell because "it's business." I want the ones that you can get them and they have a white slip over them and you pull it off to reveal a sticky side and you print out your design and stick it on. Please link me to a website or tell me what I can google to find them

How to use an SQLite database?

I'm following this tutorial: http://osxdaily.com/2010/07/08/read-iphone-sms-backup/ and it comes to a part where the file is actually a "SQLite database" and "can be read and queried like any other database." I'm completely clueless on how to use this, even though I've already downloaded what I THINK can help, "SQLite Database Browser 2.0". Please be as descriptive as possible haha.