iPhone 4 volume is really quiet I have a used iPhone 4 with 16GB of memory in it, running IOS 7.1.2. The problem with this iPhone is that the volume is really quiet whenever i'm playing music or making a call and setting the caller on the speaker.

The volume is currently at it's max (by tapping the buttons on the side).



Note: I haven't used the "broken" iPhone for this screenshot, this was just for showing what I did to increase the volume to the max.

I have tried rebooting the device a couple of times already, this didn't work.

What do (or can) I have to do to make the speaker play at a decent volume again? Do I have to replace it?
For Music anyways, check your EQ in the Music tab of Settings. Some sound quieter then others and vice versa.

For Speaker Phone I'm not so sure, but as a universal problem it may be Volume Limit, also found in the Music tab of Settings.