As I mentioned in another thread, I asked my dealer who basically said there's no SIM Card slot in UK spec cars, the online 'Infotainment', which is I believe they are calling it, is built in and free for the first year, then chargeable after. He even showed me the full option spreadsheet to prove it.
There is a specialised SIM built into the car for the Connect services. Infotainment online requires an extra data plan - either via a tethered mobile phone, rSAP connection to phone or SIM card in slot of head unit in glovebox (if fitted).
Phonebox is ment for wireless charging and extending signal to external antenna.
LTE module is needed for extra SIM usage.
3 years of infotainment services offers you map updates & information like weather, parking, Google Earth, etc. Unfortunately those paid services still need data exchange and data plan is needed (via smartphone's hostspot, rSAP or own external SIM that must be put into LTE module).