Iphone 1 1 dual-card phone disconnected.

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:

Matters needing attention

1. Mobile+Mobile, Unicom+Unicom, Mobile+Telecom, Mobile+Unicom, Unicom+Telecom are all ok, but Telecom+Telecom, the secondary card will display no signal, and it is unexpectedly found that the VoLTE function of telecom is not supported, nor can a single telecom card.

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

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