Using the smart phone app Zello it's possible to use your phone in "Walkie Talkie" mode. This has proved to be very useful when operating portable.
In the south of england Shaun G8VPG has setup a Zello group ATV south. Since I wasn't aware of any group in the east I have created group ATV East with an uncomplicated sign in procedure. Please feel free to register if you either operate portable or wish to listen in during BATC Activity Weekends.