Not sure if anyone has similar experience, but today my mum's phone was hacked where her Whatsapp was black-out. The hacker started sending messages to her contacts asking for money. He even provided a bank account number (Bank Islam), although the name is obviously fake. He also managed to transfer out money from Touch N Go, but bank-related transfers are safe. During this period, my mum's phone was not usable.

A police report has been made although I don't expect much hope to recover the money. Just sharing in case anyone knows what could have caused this.

Side note, is iOS more secure when it comes to hacking?