Error "The iPad Pad™ could not be activated because the activation information could not be obtained from the device"

Unable to Activate This iPad cannot be activated without an internet connection. You can try again, or activate by connecting this iPad to a Mac or PC. Contact Apple Support at apple.com/ support if this problem continues.

The iPad "Pad™ could not be activated because the activation information could not be obtained from the device.

Disconnect your iPad, make sure the SIM card is inserted correctly and, if you use a SIM PIN, tap Unlock to enter it, and then reconnect your iPad.

[Edited by Moderator]