How to add USSD function to SIM B Dual Sim Phone?
 

Hey Everyone,
In most Chinese Dual SIM Phones, for a sim card in Slot B, it is not possible to do a USSD Command, so for example, if a pre-paid sim is being used and the person wants to check their account balance, when the USSD command is entered. It just keeps saying "Sending Request" but never returns a result.
I have an Infinity Box, can I add the functionality to the phone software? if so, please tell me how.