Based on the provided information, it appears that the caller with the number +27100033207 is utilizing an automated system to verify the validity of phone numbers. The fact that the call hangs up immediately after answering suggests that the purpose of the call is not to establish a conversation, but rather to confirm whether a number is active and in use. This type of call is often referred to as a "ping call" and is typically used to update phone number databases or to identify potential targets for future calls.
Calls drop after a few seconds when answered—likely an automated system checking number validity.
