If you have an iPhone, you may have noticed that your voicemail is blocked. This is because your phone is trying to send a message to the person who left the message, but they are not currently on your phone. To fix this, you can try one of two methods:

  1. Change your phone number. This will allow you to leave messages without having to worry about blocked numbers.
  2. Use a VoIP service like Vonage or AT&T VoIP. These services will let you leave messages without having to worry about blocked numbers.