There is no single body to which complaints about roaming can be made. It is necessary to go to each country in turn to make very similar complaints or to approach a pair of countries to address a specific problem. It is unclear which set of regulatory authorities is responsible, those of the country where the contract was taken out or of the country being visited. Indeed, in some cases neither admits responsibility. It may be a matter for a telecommunications regulator, a competition authority or for a national government.
Roamers can seem to be operating outside the conventional regulatory framework.
This is wholly unacceptable and must be regularised. The contract of the user is with the home operator and responsibility must lie there and it must also be regulated there. The obligation should be on the operator when entering into roaming agreements to uphold the regulatory principles and practices of the domestic market. Regulation Radio spectrum is, for the present, a scarce resource. Consequently only a small number of licences can be issued in any country.