Consider the problem. When pay by plate/space machines communicate with your office, they use the same communications systems as your cell phone (Verizon, ATT, T-Mobile, etc). I’m sure you have experienced a situation where you phone works fine at some times and doesn’t at others. That usually happens when the system is deluged with folks calling, texting, and searching google. It simply isn’t built to handle every phone working at the same time.