You can not set up a direct debit on your blocked account. Please don't give your blocked account details (IBAN, BIC) to your mobile phone company or other authorities for debiting your bills from the blocked account, as these direct debits will be declined.
After you have opened a current account at any EU SEPA area bank that provides you with an IBAN you can provide these details of your current account to all the authorities that you have to pay on a monthly basis.
☝ Important: While you are able to connect a EU SEPA account with us, we recommend to contact your provider for the SEPA mandate to check, if they accept your account first!