The easiest answer, you can get Internet without too much hassle I believe. As long as you're not looking for picture mail you should be fine. Try accessing the ##3282# menu and see if you can edit the data settings. If you can access them, follow the Samsung Instinct Tutorial and modify the settings accordingly. If not, you'll need either LGDownload or LGNPST (or bitpim, dunno if the method works with this phone) with the correct files to access the hidden settings.
The other option would be the MetroPCS eri and bin, but there's no telling if the phone will accept the new bootloader or if it would brick the phone. Unless you're able to do this, you won't be able to remove Sprint completely from the phone.
Good luck.
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