Medical calls are another, strangers finding your lost stuff is a third. I'm probably forgetting more. Biggest reason - voicemail. Most numbers have a mailbox

Medical calls are another, strangers finding your lost stuff is a third. I'm probably forgetting more. Biggest reason - voicemail. Most numbers have a mailbox limit, it's somewhat common to reach a number that has a full mailbox. Sure, you should be emptying your mailbox, but this still means you can easily drop calls if you haven't checked it in a while.