Chosen Solution
Is Dual sim controlled by extra hardware or is it software specific?
A cellular phone only has one antenna for making and receiving calls, only one SIM card can be active at a time. There were several types of Dual SIM implementations when it comes to dual/hybrid SIM smartphones. Dual SIM Single Standby (Passive) - A Dual SIM Passive phone is capable of using two different SIM cards, but only one of them can be active at any time. That means that one SIM card will work, but the other will be unreachable. Dual SIM Dual Active - this implementation allows you to make phone calls from both of the SIM cards inside your smartphone. It can also receive calls on either of the two SIM cards, at the same time. Dual SIM Dual Active smartphones have both their SIM cards permanently active and, when you are having a conversation on one of them, the other still works and receives calls, messages or data. Dual SIM Dual Standby - As long as the SIM cards are both in Standby mode, you can make and receive calls on any of them. However, once you take a call on one SIM card, the other becomes inactive until the other is no longer actively used. Dual SIM Dual Active phones is that these devices have two radio transceivers, so the key is in hardware.
long story short dual sim phone now have dedicated antennas and can both receive call at the same time thanks to the more power efficient chipset tech in the smart phones cheers
