The actual test of domestic media shows that the iPhone 12 of the Bank of China version can still access 5g network rapidly after inserting two SIM cards, without being affected.
In the case of American operators, when using two lines in dual sim card mode, either line does not support 5g data and will be returned to 4glte; if customers only use ESIM and use 5g supported operators and service plans, 5g can be used.
The reason is that the U.S. version of the iPhone 12 uses the physical SIM + ESIM scheme, which is different from the domestic dual card mode.
My friends, you can rest assured. As a global model, the iPhone 12 supports 18 5g bands around the world, and the US version also supports millimeter wave, which can be said to be very powerful.