i want to bring in our technology analyst bret larson. start with the first question, we've all been on a plane and left our cell phone on. i've been randomly able to make a call at cruising altitude. can you tell us anything about the altitude the plane was flying by this headline? >> when you look at the map of where that cell tower is, it actually makes more sense it was picked up there, because the cell towers that they place along the coasts and also in our country the cell towers in the middle of the country where people are spread out more, signals tend to go farther, so they have to put in less cell towers. usually, you need to be within about a mile of a cell tower, so about 5,000, 6,000 feet. i have had the same experience of being, you know, almost at altitude or coming down from altitude when you're coming in to land about 10,000 feet and have my cell phone have perfect signal, which is entirely possible, cell phone towers leave the towers, go up, tend to go towards the sky. >> probably 5,000 feet, we don't know the duration u