If the UK operator has good 2G coverage but spotty 3G coverage, then building out 4G with VoLTE is the way to go. Future proof and cheaper too.
FYI all Japanese operators stopped 2G already. Does Tesla in the UK receive 2G/EDGE signal??
UK operators aren't going to stop 2G, as there's a lot of M2M applications out there (often using SMS rather than data) with the hardware expected to have much longer life than handsets. At least one operator has commented publicly that they may shut down 3G before 2G.
The Model S would receive EDGE if there was any, but the network it connects to in the UK (O2) doesn't have any - it's GPRS or 3G (at least in the places I'm familiar with - it's possible they have some EDGE somewhere). GPRS is close to useless, though occasionally the car will download the odd map tile.
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