Friend.tech users are on high alert after a series of SIM-swap attacks resulted in the loss of nearly 109 Ether (ETH) worth around $178,000 from four users in under a week. The attackers gained control of users' mobile numbers to intercept two-factor authentication codes, which were then used to access their accounts. Crypto investment firm Manifold Trading has warned that around $20 million is at risk of being exploited through friend.tech user-focused attacks. The firm has suggested that friend.tech should allow users to add 2FA to logins, key decryptions, and transactions, among other security measures.