Most users likely won't actually notice in the short term. You have probably been using CG-NAT for years without realising. All mobile telephone providers in the UK that I'm aware of it use it to provide Internet access on handsets when connected via 3G etc.
3's mobile broadband SIM's don't. I suspect their voice SIMs do.
James BT Infinity 2 19/09/2012 - Sold 42/6 - Getting 49/8.5 - Sync 53 / 9.5 Mbps @ 470m approx
14 years of broadband (ntl: cable to BT FTTC) - Router: Asus RT-N66U - Modem: Huawei HG612 speedtest
14 years of broadband (ntl: cable to BT FTTC) - Router: Asus RT-N66U - Modem: Huawei HG612 speedtest



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