Hi, I just tried using the 'demo' from the site. However, since I have a Singapore phone number (+65 code), I was only able to enter in my number as "0065---------" - but no missed call. Could you please let me know how to go about testing it out with this number? Thanks.

Yes. This is an amazing and hair-raising short story, written over a century ago and one that predicted the advent of digital lives so eerily.