[Edited to add what solved it for me.] TL;DR: It is allowed. I called German customer service and they added my new German number (to an originally French account) in under a minute. Hassle-free. --- Hi, I moved to Germany from France 9 years ago. I added a German number then and then added a second German number some years ago. All this time, I have been using that French account with a German number and address. Today, I tried adding a new German phone (it would be the third one in this originally French account) and I got the same error as @lricardo : "Your phone number needs to be shorter". Even though the account was French, since I have been operating it from Germany so long and wanted to add a German number, I called the German customer service number and they did it for me immediately. They were nice about it too. Be prepared to speak in German - English is supported, but only at certain times.
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