I think to use it prepaid, you going to have to jailbreak and unlock. The 3G's baseband can only be downgraded if you have a certain bootloader. If you are on 2.2 FW you can unlock with yellowsnw, if you are on 2.2.1 you can try fuzzyband to downgrade your baseband, if your bootloader is 5.08 it should work and you can downgrade the baseband and unlock with yellowsnw, if your bootloader is 5.09 you will not be able to downgrade basebands (if you need to).
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