In the overwhelming majority of cases, mobile roaming traffic uses "home routing", not "local break-out". This means it is routed to the country where the user normally resides, not where they currently are. This means:
- For people visiting the UK (and potentially staying there for a long time, if on a permissive roaming plan), their IP address won't show up as UK despite long-term residence / citizenship.
- British people visiting other countries will still be subject to OSA, even when they should not be.
- People (including British people!) who buy British AirAlo SIMs may not get a British IP. AirAlo often uses SIMs registered in a different country than the one you're visiting, and the "exit node" (P-GW) may be located in a different country altogether. I suspect this last option will become quite attractive if VPN bans ever actually come into effect.
This is pretty much unfixable without major changes in how LTE roaming is conducted worldwide, and the UK isn't important enough to make that happen.
In the overwhelming majority of cases, mobile roaming traffic uses "home routing", not "local break-out". This means it is routed to the country where the user normally resides, not where they currently are. This means:
- For people visiting the UK (and potentially staying there for a long time, if on a permissive roaming plan), their IP address won't show up as UK despite long-term residence / citizenship.
- British people visiting other countries will still be subject to OSA, even when they should not be.
- People (including British people!) who buy British AirAlo SIMs may not get a British IP. AirAlo often uses SIMs registered in a different country than the one you're visiting, and the "exit node" (P-GW) may be located in a different country altogether. I suspect this last option will become quite attractive if VPN bans ever actually come into effect.
This is pretty much unfixable without major changes in how LTE roaming is conducted worldwide, and the UK isn't important enough to make that happen.