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How does Samsung S8 import contacts?

To import/export contacts to a SIM card:

1.SIM card to mobile phone: Contacts-More in the upper right corner (three buttons in the upper right corner)-Settings (Settings)-Import/Export Contacts-Import-Import Contacts Source Select SIM card-Save Contacts to Device-Select Contacts to Import-Finish;

2. Mobile phone to SIM card: Contacts-More in the upper right corner (three buttons in the upper right corner)-Settings-Import/Export Contacts-Export-Export Contacts to SIM Card-Select Contacts to Import-Finish.