Few things in air travel are as polarizing as cell phone use on commercial flights. Though many people quake at the thought of being sealed in a metal tube next to a loud talker, others aren't quite as concerned with peace and quiet. Similarly, while some travelers savor the idea of being out of touch for a few hours, others can't bear the thought of going more than a few minutes without checking their e-mail or updating their Facebook status.

In the United States, at least, such a debate is moot since the Federal Aviation Administration shows no sings of budging from its firm "no phones" rule in the sky. But outside our airspace, some international airlines have introduced cell phone use while aloft. The services are available only on select flights, and exactly what you can do with your phone will vary, but more airlines are warming to the idea.

Most restrict use to "silent" activities like texting and e-mail, but four airlines--Emirates, Saudi Arabian, TAM, and Malaysia--allow you to make voice calls. Takeoff and landing are still times when your handset must be powered off, but calling Mom is now an option if you're flying to Dubai, Riyadh, Sao Paulo, or Kuala Lumpur. And in case you're keeping score, Emirates is the only airline to install showers on certain aircraft.

The technology, which doesn't use standard cell towers, is provided through two companies, AeroMobile and OnAir (Aircraft manufacturer Airbus is a partner in the latter company). In OnAir's case, a "leaky cable" inside the plane broadcasts the cellular signal in the cabin and also converts your communications into a satellite signal. And don't worry about possible interference, as neither company's technology will interfere with navigational systems. Of course, whether that interference even happens is a whole other debate.

Keep in mind that in an era when airlines charge for food and pillows, using your phone won't come cheap. For voice calls you should count on paying at least $3 per minute. Data charges will vary, but count on them being pricey as well. If you have an opinion on in-flight calling--and I'm sure that most of you do--be sure to answer our poll or leave your comment below.