Looks like it's a completely separate data modem + WiFi module.
It requires a separate SIM card or sharing of the SIM in your phone via SAP.
This option can only be used in combination with a data SIM card or a mobile phone with a SAP connection (SIM Access Profile).
'02 E46 330i 5MT (ED Sept '02) - SOLD
'12 F30 335i Sport 6MT (ED May '12)