Hi Matheus,
Good day! By default, data from the sensor will be automatically saved to device Flash Memory for multiple reasons such as sim card is removed, disconnection to server, or no GSM Signal coverage on a particular area. Once the device reestablished its connection to server, all the saved data to internal Flash Memory would be sent.
Although, if the Bluetooth connection is lost between device and sensor then you can not retrieve the data on the device if the Sim card is lost.
Regards.