O2 Multicard USSD codes - how to use them

If you are a user of an O2 SIM card, there are a number of USSD codes that apply to all tariffs of the mobile operator, but also special codes for users of an O2 Multicard. How to get an overview of all codes and how to use them, we explain here.

These specific USSD codes are available for the O2 Multicard

USSD is the abbreviation for Unstructured Supplementary Service Data and refers to a collection of codes that are entered on the cell phone keypad. The codes vary between mobile phone providers and are used to change settings and request status information. If you are an O2 Multicard user, there are a number of special USSD codes. Please note that you must always confirm the code entry with the handset key for it to be executed.

1. By entering the code *120#, you will be shown a list containing all available USSD codes.
2. To get an overview of all active SIM cards or to find out which SIM card receives calls first, the codes *121# and *122# respectively will help you.
3. In addition, changes to the settings of the call, SMS, and MMS reception can be made via USSD codes.
4. If you want to restore all default settings, this is done by executing the code *128#.

O2 Multicard: These other USSD codes are important

In addition to the special codes for the Multicard, there are some important codes for all O2 users. For example, the account manager can be accessed by entering the USSD code *100# and confirming it with the receiver key. The remaining credit on your prepaid card or the validity of the card can be determined by entering the codes *101# and *102#. If your credit is low, it is possible to recharge it by credit card with the help of USSD code *103*Cashcode#.