The "could not activate cellular data network" error means your iPhone won't be able to use the mobile data you're paying for ...
If you bought a new iPhone, then you need to activate Face ID attention awareness, Find My, Optimised Battery Charging, ...
Apple today updated its iMessage troubleshooting support document to add a scenario that can occur in iOS 26. If you don't activate iMessage or an eSIM when setting up a new iPhone with ‌iOS 26‌, it ...
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