Our company have sat fones in our 757's and also on in ops. Must admit that they are rarely used as the crew normally use their company mobiles or use a phone patch thru Stockholm radio. I have used the Iridium handsets in flight over Turkmenistan to call the UK with no problems and on the ground in Baku, Kabul, Robertsfield and various parts of Africa again with no problems both making and receiving calls. I've no idea of the call charges but i know the handsets are around £1000 each.....