That’s how easy it was to date. But it will get more complicated in the future with eSIM smartphones, since the previously exchangeable SIM card is now permanently installed. This allows service to be obtained from multiple providers, for example, from local providers when on vacation. It is no longer necessary to replace the SIM card. This is convenient but carries risks if the smartphone is lost because the owner must then contact each individual provider to block his number.
With a decentralized blacklist based on blockchain technology, Deutsche Telekom IT together with SAP and Camelot will be able to ensure that customers can have their smartphones blocked faster, regardless of the number of contracted service providers and phone numbers. “The goal of Global IMEI Storage and Services is to build a decentralized blacklist that allows providers worldwide to view the blocked IMEI number,” says Stephan Westermeyr, Director of Order Management & Billing at Deutsche Telekom IT.
“In the first step, Deutsche Telekom’s blacklist will be anonymized and decentralized for other partners.” Then other network providers, government agencies such as the police, or the users themselves can see which smartphones are locked. Also, for online purchases, for example, on eBay, a public blacklist makes sense. This means the buyer can check with just a few clicks if the cell phone has already been reported stolen. “Meanwhile, other network providers have announced they want to support the blacklist blockchain,” says Westermeyr. “We then plan to roll out blockchain more broadly for smartphone abuse and involving manufacturers as well as other telecom providers.”