There's no reason to think the telecoms were too dumb to think of that independently, and try it, if it were true.
AT&T had a problem where they could not create a bill for some government networking services. It was build in that they had a fixed window which kept expiring. This went on for years while they fought to keep the contract...
I don't recall all the details but read up on FTS-2000 it was a mess.
>http://www.three.co.uk/Discover/Phones/Feel_At_Home
>Use your phone abroad at no extra cost in
>Australia
>Austria
>Denmark
>Finland
>France
>Hong Kong
>Indonesia
>Israel
>Italy
>Lanzarote - Spain
>Macau
>New Zealand
>Norway
>Republic of Ireland
>Spain
>Sri Lanka
>Sweden
>Switzerland
> and United States