Of course – it is possible for you to use your access data for your different devices. If, for example, your laptop's battery power runs low, you can easily switch to your WiFi-enabled smartphone and access the internet there, as well as vice versa. The login details can be found on the confirmation page after you have successfully purchased internet access on board or in the email confirmation that you received from Deutsche Telekom. With the access data you can only connect one device to the internet via WiFi at the same time.