Based on the provided information, it appears that the caller with the number +61870951286 is likely to be a telemarketer or a spam caller, as the user did not recognize the number and no voicemail was left. The fact that the user did not answer the call and no message was left suggests that the caller may not have had a personal or urgent matter to discuss, which is often the case with unsolicited calls. As a result, the user's cautious approach to ignoring the call seems justified.
I received a call from an unknown number, but I didn't answer, and no voicemail was left behind.