LG enV on Sprint

I know this question has probably been asked a thousand times but I have been reading these forums for hours and every post there is always 2 answers and neither ever agree.

I have an enV2 and I bought it when I was with Verizon. I use Sprint now. I want to use this phone on Sprint's network. I do NOT use data, only basic texting, no pics, no vids, no nothing just talk and text.

I love this phone becuz it allows u to use any form of sound .wav or .mp3 etc. as a sound on my MicroSD card and then apply it as a ringtone or a picture as a wallpaper and so on.

If there is ABSOLUTELY NO WAY to flash this phone to Sprint...is there some sort of way to unlock/crack/hack/slap/invade the SPRINT PHONES to allow the same use of .wav or pic files for ringtones and such? (Im tired of using myxer)

If you can decifer this mess of jargon I have compiled in this "humor me" post please respond asap. I NEED YOUR HELP GEEKS UNITE!!!

Please and thank you in advance.