rulefan
Tour Winner
I have a rules app on my phone. Not sure if it is legal to use during a qualifying comp
There is no breach of any Rule of Golf if using a Rules App.
However, the Club may have an internal regulation prohibiting all (except possibly emergencies) use of mobile phones on the course.
They cannot DQ you or award any other form of golf penalty. So you qualifying score would count. But they could take disciplinary action (eg suspension of playing rights for a period).