I think I've figured it out. During the 45 mins between Bri's call and leaving the apt, SM dropped off the pregnancy test, Heather did the test and rushed to meet SM with the results. She is to meet SM at Longbeards (calling the pay phone because she didn't know it wasn't a good number) and both of them were there and killed her. Then one drove her car home to pick something up or to check something out ( her phone was still in the car), and the other drove the truck home to retrieve SM's phone. His phone was turned on at 3am and that's the phone they used from this point on. The call from the PTL to SM's phone was a Moorer calling for the pick up. I wouldn't be surprised to learn that they put her body in the dumpster. Her SIM card could very well be in another phone right now, just like KT alluded today.