Right then - here we go....
aircraft is either an ATR 42 or 72 with 60+ seats but we're only going to half-fill the plane. Passengers comprise family groups of four (2 adults and 2 kids) who have won a public competition to view a fireworks display from the air. Expected altitude is c.1500 feet amsl. The company I've chartered the plane from are extremely helpful, but it would appear that a standard mobile phone would be a no-no (doesn't it play havoc anyway by locking in on multiple ground cells?)