you could try using a high-pass filter, after some experimenting in Audacity (free to download from here: http://audacity.sourceforge.net/)
I could make a pretty good telephone type sound using Effects>High-pass filter and a value of around 1000 in the box.
I expect you can do this in an editing app too.
I'm just having fun playing with sound at the moment, hence suggesting this program elsewhere in the forum recently.
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