I know! I really just need a cell phone for - get this - making calls!
Not sure, but my guess would be that the person on 3G won't (always) get your calls/texts and people on 3G will continue to have an increasingly harder time making calls and getting texts to actually send. I'm still receiving texts and voice mails, but I'm not getting the actual call, and it takes up to 30 minutes for a text to be sent, if it even sends at all.