A significant WhatsApp outage is affecting users in the UK and other countries, with a surge in complaints reported. Downdetector indicates that around 49% of users are unable to send messages, and 46% are experiencing issues with the app. The outage has escalated, with over 100 users in the UK reporting problems, up from six an hour earlier. Users from India and the United States have also reported disruptions, with over 3,000 complaints in India, primarily related to message-sending issues. Complaints have been voiced on social media from users in Canada, Brazil, and Singapore. Some users are also facing challenges with other Meta-owned platforms like Facebook and Instagram. This outage follows a previous incident earlier this year that affected at least 68,000 users.