Is it something to be concerned about

I wish I understood that ^^^^...........or maybe its better not to know?

There were suggestions on how to answer the calls, but unfortunately after blocking the various numbers there is now a number on my answer phone, and when I activated the answer phone to hear the message it automatically dials out, I have tried resetting, I have removed the sim card and cleared the voice mail but whenever I replace the sim card it comes back on, which I take it, it has fixed on to the sim card so I now think I will need a new sim card which means a new number and everything that entails