Use your device offline
In places where you do not want to make or receive calls, you may still access your calendar, contacts list, and offline games if you activate the offline profile. Switch the device off when cellular phone use is not allowed or when it may cause interference or danger.
On the home screen, select the profile and Offline.
When the offline profile is activated, your connection to the cellular network is closed. All radio frequency signals between the device and the cellular network are prevented. If you try to send a message, it is placed in the Outbox folder, and is sent only when another profile is activated.
You can also use your device without a SIM card. Switch the device off, and remove the SIM card. When you switch back on, the offline profile is activated.
Remember to comply with any applicable safety requirements.