Problem with iphone ringtone hearing?

I'm using iphone 4 version 5.1.1.
it was fine until few days ago but since yesterday,
whenever i get phone calls, i can't hear my ringtone.
My ringtone is a doorbell which is a default ringtone.
I have tried many things like go to setting and adjust all the sound settings and turn off the bluetooth or A2DP.
And i have tried re- setting my phone but it still doesn't work.
I can hear the ringtone through my headset. But i don't use it often so its a problem to me.
Is there any other way i can fix it with out going to the apple store?
I literally tried most of the things i can do.
Please help me with this. Is there any way i can fix this? Or do i have to go to the store?

Why Won't My iPhone Screen Go on?

I just dropped my iPhone 4 in a protective case, and even though it was in the case, after i picked it back up, the screen was black and wouldnt turn back on, i hear the connecting sound when i plug it in to charge it, but the screen will not turn on for some reason.
I've restored it and held home and sleep button for 10 seconds and that hasn't fixed it

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About a week ago whilst at rugby my water bottle lid cracked open when someone trod on my bag, which at first isn't a problem, but id left my phone in their alongside it and now the speakers seem to think they are docked the whole time and don't let me play music or video/Movies. It still rings when someone calls though, any ideas or advice?

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I recently restored my iPhone 4 from backup and I noticed that it wiped out my computer's space clean. I went from having 6GB free to 202MB free space. I want to know, how can I get this space back. I'm on a PC not a Mac.

Thank you.

Added (1). Do I Really need to delete the backup for this?

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I put my iphone in the cup holder of my car and my mom put water in the cup holder for my dogs, so my phone was in it for about 3 mins, it did notget into where you plug the charger in because of my case but did get into the speakers and now it won't make any noise anyway i can fix it?

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