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I want to use some wav files as my ringtone/text tone but a lot of them have a very low volume. I know my phone can be louder because I have put other files in it that are. Is there any way to make the volume higher on a file and save it?

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Audacity is an excellent free, cross-platform GUI tool for this. Look for "Amplify" in the "Effects" menu.

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Doesn't let me amplify past like 0.1 – this is a dead end May 8 '11 at 8:00
Audacity is not the most intuitive, but it should do the trick. Review the guide – Ray Mitchell May 8 '11 at 17:33
This did it but it just doesn't sound as high volume as other sound files I have on my phone. Even if I amplify it by a lot it starts to sound weird. – this is a dead end May 10 '11 at 9:13
Well, it's not magic. If your sound file is too quiet, then there may simply be too little information left. You could compare it to an underexposed photograph that you try to restore by turning up the brightness. – Ryan Thompson May 11 '11 at 6:45
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SoX's vol predicate can increase the volume on the output file.

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