Wow, their customer service is awesome!
I e-mailed them, and within an hour got a reply back offering me 2 options available to me..
#1, keep the phone, use it till they switch over, then buy a new phone (which they said they'll be offering deals to current customers) and transfer the balance of my card plus keep the same phone # for free.
#2, send the phone and the card back, get my money back, and just start anew once they make the switch.
I'm opting for #1 because that way my dd will be able to have a phone to use from the time she gets it on Saturday till the switch-over is final. Plus, I'll have the 2nd phone then to do with what I want.. (if I buy a SIM card from any company, could I use this phone, anyone know?)