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We are from Germany and I would therefore like to use the account from abroad. Is that possible?
Yes, this is possible, Once you have activated your account you will have online access from anywhere in the world to toggle the counries you wish to be able to dial or block, these changes are instant and quite easy to perform.
As for the registration of your device, It is most definitely possible to register your phone abroad, registration is only reliant on a steady internet connection, as well as the consideration of any additional or out of the ordinary firewall restrictions with regards to the router you are using to connect to the internet.