You can buy a mobile bus ticket on the Oxford Tube app. Simply:
1. Tap 'Get your ticket' on the menu
2. Select 'Buy Tickets'
3. Toggle across to choose your ticket type
Remember to choose the right passenger type and to check the ticket terms and conditions. Once you've done that:
1. Tap ‘Buy ticket’ for each ticket
2. Go to your basket and click 'Proceed to Secure checkout'
3. Follow the prompt
Easy peasy