Remove iphone marks and speaker not very loud?

I have an iphone 4 and have had a case with a patterned Back on the inside. Does any one know how I could remove the marks it has left? Also my speaker is a lot quieter than my friends iphone 4 speaker- any ideas on that?

Could be a fake version. China have made loads. Basically undetectable. Apart from performance wise:/

  • Why do I do this? I'm very very very tired yet I don't want to sleep? I want to sleep because I'm practically blinking and bobbing my head side to side like a drunken man but I just don't want to sleep. I watch tv or go on Facebook or play on my iPhone. And I'm starting to get dark circles. And as a guy I don't wear. Concealer or whatever
  • Portable Speaker, connects fast, loud, affordable? My car radio is broken beyond repair. I had purchased a cheap bluetooth speaker. Unfortunately this speaker takes a while to set up the bluetooth mode everytime I get into the car, and it's not loud enough. Looking for a bluetooth portable speaker that connects automatically or has an aux cord, and goes loud on a sound test. (I want to be able to hear the music if I put my car windows down, I have the iphone 6 plus.)
  • My iphone 6 is makind very loud static noise? I was watching a video on the facebook app and turned on the sound but instead of music or talking there was very loud static noise although i had the sound on at lowest. I thought it was just the app so i quit and and opened it but whenever i tried to put on the sound there was the static again. I then tried to listen to music but whenever i pressed the play button, once again, there was very loud static noise. I tried to restart my iphone but it did nothing. Any advise?
  • Is the iphone 5s loud speaker wise? I want the iPhone 5s which I'm getting. And I want a loud speaker for music. I have a galaxy now that's real loud but I'm having problems so I'm goin to apple. Is the 5c louder than 5s? Or is it the other way around? Is it loud for music? Please know for sure though if you have one.