When ireff is here no need to remember your operators ussd codes. As now a days people use minimum 2 sims and they easily forgot their ussd codes. iReff remembers the ussd codes for you. You can search any operator of any city ussd codes from this app and also place a small widget on your smartphone homescreen to easily access the ussd code. I am using it form a long time and my friends got confused that how I can remember so much of ussd codes. Thanks ireff for your help.