Huawei P8 MAX - Dual-Card Settings

4G/3G slot
ᳮᝣረү஝૶
ᳮᝣႃភηৌ
Card 1 Card 2
2G/3G/4G
Card 1
2G
Card 2
3
Dual-card settings
When you are using two SIM cards, the lower card slot is set as the
primary card slot by default, supporting 2G, 3G, and 4G networks, while
the upper card slot is set as the secondary card slot, supporting 2G
networks.
To switch the primary and secondary card slots, touch Settings > Dual
card management , and set Card 2 as the 4G/3G card slot.
If you are using only one SIM card, the card slot you insert your SIM
card into will be set as the primary card slot.