As of next month, you will be able to add a third way to pay for your commute.
Following hot on the heels of contactless payment by bank card, from July you'll be able to pay using your iPhone or Apple Watch. Simply tap your device on the payment pad and you'll be on your way.
The service will be capped (as it is with other forms of contactless payment) so you will get the best value from a day or week's travel.
Of course, some trailblazers on EE are already using this service (or one very much like it).
Welcome to a brave new world.