You should always have a valid ticket before boarding. This is also the case when your smartphone or mobile phone’s battery has run out.
What if your mobile phone or smartphone dies after you board?
Don’t worry. The inspector can perform an online check. If you give him your mobile number, he or she can verify that you bought a valid ticket on time.
What if the battery runs out before you can activate your m-ticket or before you receive your SMS ticket?
If you have not activated an m-ticket and you have not received an SMS ticket before your mobile phone’s battery dies, you do not have a valid ticket. In that case you have to buy another ticket from a different sales channel before your journey. If you don't, you may be fined for fare-dodging.
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