Around a year ago, André Tenreiro was called into a meeting between the chief technology officer of the phone carrier he worked for—one of the largest in Mozambique—and an executive of the country's largest bank. The latter had seen an escalating pattern of fraud based on so-called SIM swap attacks, where hackers trick or bribe a phone company employee into switching the SIM card associated with a victim's phone number.

Get in-depth coverage of current and future trends in technology, and how they are shaping business, entertainment, communications, science, politics, and society.