Samsung Galaxy Z Fold5 cannot make calls or send messages

The checks in more detail

Wi-Fi calling should be on if your carrier supports it. For messages, check the default messaging app and RCS chat features, clear the app's cache, and restart. Calls that fail to ring when the phone is folded may be affected by the cover screen's settings; check Settings, Notifications, Lock screen on the cover. If the other person cannot hear you, test with Bluetooth off, since the Fold's Bluetooth can take the call. A SIM or eSIM profile problem needs the carrier. Update the software.

The Fold5's Flex mode and the multi-window feature let you take a call while using apps on the inner screen, and the call banner may appear at the top of one half, so a call can seem missed when the banner is hidden by a full-screen app; check the notification settings for Pop-up for calls. Also check the cover screen's always-on setting if you rely on glancing at it. Samsung's Edge panels and the Fold's taskbar can also place calls and messages in odd places, and you may find a call answered on the wrong screen;

the Phone app's setting for Answer calls with the Home key or Power key on the cover screen changes behavior, so check them if answering is awkward. Keep the phone's software up to date because call handling on foldables improves with updates. Check that Samsung Messages or Google Messages is the default for texts, since two messaging apps can both claim messages and one of them may not display them. Open Settings, Apps, Choose default apps, SMS app, and select the one you use. If messages from one contact never arrive, ask them to resend and check Blocked numbers.