You ask is very power consumption this is to be examined relatively than a single card power consumption is certainly but not too obvious but if compared with the wm system of the phone is small compared to the big thing The main power consumption of the phone is still in the processor and the motherboard screen The genuine cell phone dual card dual standby rarely cottage cell phones are generally very power consumption I hope to help you

The dual card dual standby is a good idea, but it is a good idea to use a dual card dual standby.