Raisin uses mobile TANs (mTAN) to authorize financial transactions. When you initiate a transaction, an individual mTAN is generated and sent to your mobile phone by text message. Please make sure that your mobile phone is configured to receive text messages.
An mTAN provides additional security because it acts as a form of two-factor authentication in combination with the PIN you use to log in to the Raisin Online Banking System. If your login data is stolen, no transactions can be performed without the access to your mobile phone.