Birthday Reminders
Configure Calendar to import birthday information from your contacts and automatically create birthday reminders.
Before using this feature, ensure that you have added birthday information to your contacts. For more information, see Creating a contact.
1. Open 
Calendar.
2. Touch and select Contacts’ birthdays.
Once you have enabled this feature, Calendar will automatically import birthday information from your contacts and send you birthday reminders.
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Huawei Mate 10 Manual [PDF]