If you’re like most people, you probably use messaging app WhatsApp to communicate with friends and family. But if you’re an iPhone user, there’s a chance that some of your messages have been sent but not received. To fix this, open up the Messages app and look for the message that says “Not sent.” If it’s not there, try again later when you have more time. If it’s still not sending, then you may need to check your phone’s iCloud account and see if any of your messages have been added to the cloud storage.