This article has been reviewed according to Science X's editorial process and policies . Editors have highlighted the following attributes while ensuring the content's credibility: South Korea's largest carrier SK Telecom started on Monday to replace mobile SIM chips for its 23 million users following a data breach. South Korea's largest carrier SK Telecom started on Monday to replace mobile SIM chips for its 23 million users following a data breach, prompting alarmed customers to form long lines for the r ...