You can identify yourself by doing your next payment with a Belgian debit card. Law dictates this identification has to be repeated within 18 months following this first identification.
If you set up an Easy Payment method with a foreign bank account, you won’t be able to activate a prepaid SIM card. Your first payment and the control payment after 18 months always have to be done with a Belgian payment method. For all other top-ups you can of course use your European bank account.