13pm Card Sticking Unicom 4g Mobile 5g is a mobile phone design problem. The reason for this is the following：

1 and Apple 13pm only have one card slot, and two sim cards can be placed back to back, with the chips facing outward and aligned with the slots.

2. The face-up card is card 1, and the face-down card is daughter card. Card 1 and card 2 can be set in the settings.

3.iPhone 13pm provides users with dual-card dual standby, which can support mobile, Unicom and telecom 5G, 4G, 3G and 2G networks.