A NetBox creates about 20 MByte data per day. Occasionally (normally less than once a month) a firmware update is distributed with a size of 250 MByte. A SIM card monthly data volume of 1 GByte is recommended.
If required, utilize the XL2 and NetBox in Gateway Mode.
Yes, all XL2s registered in a single user account share the purchased Data Days Credits.
The online Data Day Credit monitoring is presently not available yet. Your partner will provide you a Data Day Credit statement for every month.