AW: 3G SIMs?

[Ian Stirling]

Andreas Kostyrka wrote:
> Well, in most cases yes, as all 3G SIMs (USIM) I've seen have been valid GSM SIMs. i'd expect that to be some requirement even :)
> 
> OTOH there are carriers that are UMTS only (they don't have a GSM network), e.g. 3 in Austria.

And others - '3' in the UK that don't have a GSM network, but have 
roaming agreements with other operators. So it costs them if you only 
make GSM calls.
So they eventually ban the SIM if you don't use it in a 3G capable phone.