Here are the details of my device:
Motorola Moto E
Android 4.4.4
Kernel: 3.4.42-g6bc7ff3
Build: KXC21.5-40
In the "Phone" application, I checked the "Remember SIM for number" option for a USSD code (*123#) for SIM1. Currently, I am unable to reset this feature, and hence cannot dial *123#...