These are the codes for the Fonic network in Germany. The USSD codes for Fonic listed below are the latest codes. Much like other networks in Germany such as the USSD codes for O2 and the USSD codes for T-Mobile in Germany there are limits to what can be done.
USSD codes for Fonic
These are the two USSD codes for Telefonic which you can use. You can check your balance on the Telefonic network as well as charge a prepaid card with the USSD codes from Telefonic.
|* 100 #||Check account balance|
|* 103 * recharge code #||Charge the account with a prepaid card|