The European Commission's decision means that Europeans who travel within the EU will pay the same mobile phone charges they do in their home country.
4G wireless networks in the US are faster and more widely used, but download speeds are worse than in dozens of other countries, according to OpenSignal.
The next evolution in wireless networking holds promises of self-driving cars and movies that download in the blink of an eye. 5G is big at this year's Mobile World Congress, but don't expect it until 2020.
The company says it plans to be an "active" participant as a newly minted member of the GSM Association.
Humanity has reached a milestone on our journey toward the inevitable confrontation with Skynet. For the first time ever, there are now more active mobile devices on planet Earth than people.
European lawmakers vote to end international roaming charges by the end of 2015.
EE, Vodafone, O2 and Three have teamed up with industry body the GSMA to combat spam texts and are looking to take on nuisance calls too.
The GSMA has spent years steering mobile phone technology. Now it expects a big new business in hooking other types of devices to the network, an idea called the Internet of things.
Urging compromises so that today's 27 separate mobile-network markets can be replaced in effect by just one, the European Commission's Neelie Kroes lays out several ideas for reform.
The GSMA, which represents hundreds of carriers, says European Commission VP Neelie Kroes' effort to eliminate roaming fees is causing regulatory whiplash in the mobile network industry.