Thanks for the reply. The mobile phone was my sons a Huawei model. I have a Highsense U972 which runs Android 5., also did not work. The old Samsung Galaxy Trend Neo works 100%. Used it a lot over the weekend and only stopped once when ARC picked up a short on the track. I even manage to get my wife to race me I used to race 1/24 scale club racing. Impressed with the ARC Air system The Pace Car works well with Android and great feature.