Did you look in the freezer??
Oh but let me explain - LOL ......
I have one of those Tracfones and I "lost" it about two month ago - ripped the house apart - could not find it. So ...... bought a new one after two weeks. The night before the new one showed up, I went to the freezer and saw a plastic grocery sack with some frozen vegies in it - grabbed it to move it but there was something hard in it .... YUP - there was the cell phone.
Getting back to the foot - you will find it in the most unexpected place. Hopefully before you buy a new one or sell the machine!!