Home phone rings: Private number. I ignore it.
Cell phone rings: blocked number. Oops, that's the signs of a doctor and not a spammer. I answer.
Here is the exact conversation:
"Hello, I'm calling from Dr. PCP's office. We have been going through our records and noticed you are behind on your mammogram."
"Um, no, I don't think I am."
"Oh? Why is that? Did you just have it?"
"No, I have Stage IV, metastatic breast cancer. Your records on me should be about five inches thick."
"Oh! I'm sorry! I, um, I, ugh, well, um, we'll be sure to update your, um, records with us."