I recently did some cell phone shops for MF. The instructions (CP) specifically said, "do not call before performing the shop." I did not call them, one location was out of business, and I was paid about half the normal fee. I felt this unfair, in part because I was not allowed to pre-call, and second, because the scheduling, travel, and reporting take the same amount of time as it it were a full shop; the actual time in the store is short in comparison.