However, this method is difficult to implement because of the overlap between carriers and infected patients.

But digital technology is quickly erasing the differences between carriers.

But in areas of the world with real competition between carriers, buying off contract isn't uncommon at all.

This allowed a fair competition between national and foreign carriers.

What remains to be seen, however, is whether legal help will settle differences between carriers and clients.

This is where cross connection between carriers takes place.

The company also trimmed its sales estimate by 1.3 percent as a growing price war between carriers forced it to cut local phone rates.

A year ago, for example, it was difficult to send short text messages between carriers.

He also predicted no debilitating fare war between carriers this year.

This means the exchange of information between carriers, but not such as to allow collusion.