You can buy up to 5 My Truphone plans at once. You may only use one plan at a time. This is useful if, for example, you are already using a European plan but travelling to Australia.
As soon as you land and buy a local Australia plan, the My Truphone app will detect your location and automatically switch to the Australian data plan. When you return, and if your European plan is still active, the app will revert to your European data plan.
Currently, you cannot buy multiple data plans during a single checkout. But you can return to buy another plan by clicking “Add data” from the My Truphone app.
If you would like to buy a plan but not activate it straight away, please see here.