You may occasionally encounter a “message not found” error message from an unknown number on your iPhone, either once or multiple times. The “unknown message not found” error on iPhone almost always appears as an actual text message and not a system error or warning, but it can still be frustrating and confusing, especially if you get a lot of them. Here’s what causes these errors and how to fix them.

The “unknown address message not found” texts are usually nothing to worry about and are not a sign that your iPhone is broken or dying. These messages are usually caused by a minor software glitch in the iMessage or FaceTime apps, a weak Wi-Fi or cellular signal, or a minor disconnection between your device and your carrier.

Here are several proven solutions that can resolve the issue of missing messages from unknown senders.

Check your cell reception. If you’re only getting a few bars, this is likely the cause of all the missing message errors, as the content can’t be retrieved from your carrier’s data centers. You may need to move your phone to a part of the house with a stronger signal, or possibly upgrade to a newer handset.