So my original D4 got messed up and they sent me a warranty phone. When I got it I used the SIM card from my original phone and put it in the new phone. I didn't realize they also sent me a new SIM card. Sent the defective phone back and haven't heard anything since. My question is, would using the original SIM cause any problems (I am having trouble connecting to GPS)? Should I have used the new SIM card? What can I/should I do with this new SIM card?