There is a new attack on Apple Pay involving an old phreak tactic. Read about it here:
Has Your Phone Number Been Stolen? Another Apple Pay Fraud Hits the Nation
The fraud works by knowing the mobile carrier and number the target uses for device identification, contacting the carrier to port the number to a phone the criminal has, then using the number to authenticate and add the criminal’s device to the victim’s Apple Pay account. Illegally porting telephone numbers has been around for some time. Criminals are re-using the old technique to subvert Apple Pay’s device authentication mechanism.
What can consumers do to protect themselves? First, use a telephone number that is not well known for device authentication. Many people use their home landline phone number, which is often easy to discover. Second, inquire with the carrier about their policies around authorizing porting and notifying customers. Third, keep a close eye on Apple Pay for unfamiliar devices.
The ways banks can protect consumers is as old as the tactic of stealing phone numbers. It comes down to account monitoring and fraud detection. Today's behavioral analytics are equally adept at spotting misused credit cards as they are spotting misused accounts linked to Apple Pay. Banks and other financial institutions must review their anti-fraud programs to ensure they apply to emerging payment processes like Apple Pay.
All in all, this is an example of an old tactic being applied to a new payment processing system. When developing new systems, it always pays to consider how previous attacks might apply.