The European Union (EU) plans to place restrictions on the amount of data customers of mobile operators can use when abroad.
The draft law released this week shows that the European Commission plans to include a ‘fair use' clause that would limit the amount of free roaming to 90 days a year and a maximum 30 consecutive days before regulated roaming charges apply.
However, anyone commuting from London to Paris via the Channel Tunnel, for example, won't be subject to the new limits if they return to their home network every day.
Moreover, anyone busting their limits will have their roaming surcharges capped at 4c per minute for calls, 1c for every text message and just 0.85c per megabyte of data.
Operators will also be able to impose restrictions on call and data volumes, and will be allowed to require subscribers to pay for a certain volume of services on their home network before the contract can be used for roaming.
This is to prevent SIM-card arbitrage, in which cards are bought in one country and resold in a country where prices are higher.
The draft cryptically stipulates that "the customer should nevertheless be able to consume volumes of such services equivalent to at least the average volume consumed domestically by the customers of the tariff plan in question".
This would appear to mean that mobile operators won't be allowed to set a cheeky low limit for roaming.
The new law should come into force on 15 June 2017. The draft will be circulated among member countries and the EU's Body of European Regulators for Electronic Communication before adoption, which is scheduled for 15 December 2016.
Mobile operators had argued that the lack of a fair use clause would encourage customers to seek out the cheapest contracts in the EU, which would punish operators in countries where costs are naturally higher, for example owing to population density or higher taxes.
It might also affect mobile investment in countries with high levels of migrant workers who might stick with contracts in their home countries.
The EU has attempted to remove cross-border roaming charges since at least 2009 and has drafted legislation accordingly since September 2013. The EC finally managed to secure agreement to end roaming charges in June 2015.
Despite the slow pace of implementation, the EU has nevertheless cut the cost of roaming charges with a series of caps on the amount that mobile operators can charge.
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