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You can select a default SIM card for mobile data services. – This feature is only available on dual SIM phones.
– Features may vary depending on your carrier.
1. Open 
Settings.
2. Touch Dual SIM management.
3. Toggle the switch Default mobile data next to the selected SIM card.
Questions about your Huawei Mate 10? Post in the comments!
Huawei Mate 10 Manual [PDF]
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