This may happen one of two ways:
Either way, once a mobile number has been successfully taken over, criminals will receive text messages containing password reset/verification codes (often referred to as 2SA or 2FA). This gives them access to your existing online accounts - banking and email accounts are major targets for such attacks.
A typical indicator of an Unauthorised Port/SIM Swap is the loss of phone coverage or reception of the affected mobile phone. SOS in this instance means that your network provider is no longer providing service to your device. Other common indicators in addition to your phone SOS display includes being locked out of accounts such as Internet banking, emails, or other services that rely on password reset/verification codes.
If you are connected to wifi at the time of the porting/SIM swap, emails from your financial institution referencing updates to your list of payees or funds transfers may indicate your number has been ported.
Please Note: If you receive a text from your mobile provider (or another telco) that your number is about to be ported, respond ASAP to the company who have sent the text as you may be able to stop the port.
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Facebook give users the option to enable email or login notifications.view fact sheet
Twitter is a virtual and public forum used by individuals, groups and businesses.view fact sheet
Instagram is a social networking app made for sharing photos and videos from a smartphone.view fact sheet