SINGAPORE - Accounts executive Amanda Teo remembers the day she woke up to her mother banging on the door of her Housing Board flat in near hysteria, after she did not return any of 13 phone calls.
Buying a doorbell had not been a pressing concern for the 29-year-old as she could not find one she liked and - somewhat typically of a millennial - she had assumed that anyone wanting to visit her would call her on her mobile phone.
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