Apple 1 1 Why can't the secondary card receive the SMS?

First, the dual-on and dual-standby of Apple's mobile phone has not been very stable since the previous generation, and the signal quality is very unstable after installing dual cards. Especially when mobile phones pass through tunnels, underground garages, elevators, etc. There seems to be a signal. In fact, it is necessary to reset the phone to flight mode and turn it back.

Second, the dual-on and dual-standby of Apple's mobile phone does not support inserting two telecom mobile phone cards at the same time. If plugged in, the secondary card cannot talk.

Extended data:

1. Mobile+Mobile, Unicom+Unicom, Mobile+Telecom, Mobile+Unicom+Telecom, but Telecom+Telecom, the daughter card will not display the signal. In addition, I happened to find that I don't support the VoLTE function of telecom, and I can't support a single telecom card.

Second, when one card makes a phone call, the other card can't stand by and the Internet signal disappears. Simply put, it is "dual card single pass". When one card makes a phone call, the other card cannot keep the phone and data on standby.

3. When making a call, please click the phone number label near the top of the screen on the dial, and then click the number you want to use to switch between different phone numbers to make a call.