Fraud a “total loss” for consumers: criminals take over cell phone numbers. E-SIM swapping is so perfidious because the criminals' approach is quite difficult to understand at first glance.
You can request a log-in code online, which you can use to open your customer account, just by providing your telephone number. If this code is then passed on to the criminals over the phone, the account with the mobile phone provider is cracked. In a scam, criminals create an electronic SIM card on their own cell phone.