IPhone 4 no sound in one speaker only getting calls on home screen and not vibrating?

Hi, I just got an iPhone 4 on Saturday. On Sunday I noticed that it wasn't vibrating at all even if it is on vibration mode. I decided to play with it to see if there were more problems, and I found that I wasn't receiving calls unless I was on the home screen, and that sound was only coming out from my right speaker. I checked everywhere in settings to see if maybe these were all just weird settings that were on, but didn't find anything helpful. My mom will take me to AT&T soon to see if they can fix it, but is there anybody out there who can tell me how to fix this?

Send it to apple so they can fix it

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