Get a German SIM / mobile plan
A German mobile number makes everything easier — banks, delivery services and Behörden expect one. Prepaid SIMs require passport identification (PostIdent/video).
Official source1Choose prepaid or contract and register
Prepaid is fastest to start (identify with your passport via video or at a post office). Contracts are cheaper long-term but usually want your IBAN and Meldebescheinigung.
Passport · IBAN (contracts)
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Procedures vary by city and office and can change. This is general information, not legal advice — always check the official source.