Let's say 2 cards are inserted into the phone, and SIM #1 is being used for data/Internet in 4G/LTE network.
The question is: what mode SIM #2 will operate - will it switch to 2G/GSM only or 3G/UMTS?
Thank you for the reply!
P.S. I understand that in case SIM #1 being used for data, then SIM #2 is being used only for calls. Just would like to confirm the mode SIM #2 can operate. For example, Xiaomi Redmi Note 4 with MediaTek 6797 (Helio x20) allows SIM #2 to operate in 3G/UMTS for calls while SIM #1 is used for data/Internet in 4G/LTE network.