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Unable to add foreign bank account number to Congstar prepaid account

I bought a Congstar prepaid card, activated then selected a package, but it seems that I can't add IBAN bank account number unless it starts with DE? See attached screenshot. What do I do now?
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35 views

Need info regarding cheapest mobile connections and internet plans in Berlin [duplicate]

What is the cheapest and reliable mobile network in Berlin? I may also ask what are the most effective Internet providers/connections in Berlin? I will be moving to Berlin for the very first time and ...