How does oppo mobile phone open 4g network?

Due to the requirements of current operators, mobile phones use 4G networks by default when they leave the factory. OPPO phones do not have a 4G network switch when they leave the factory, so they need to be turned on by themselves. The opening method is as follows:

1. Enter *#2323# in the system dialing interface.

2. At this time, if the mobile phone is under mobile 4G, the mobile phone will only turn on mobile 2G.

3. This is the re-entry setting-dual card and mobile network-there will be a 4G switch under ——GM (of course, you don't have to enter *#2323# every time).