Productivity and CRM Tools:

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Calendar Apps: Birthdays and anniversaries from contacts can be automatically added to your calendar. Meeting invites can be sent directly to contacts.
CRM (Customer Relationship Management) Software: Businesses often integrate their phone's contact list with CRM systems to log interactions, track leads, and manage customer relationships.
Task Managers: Assigning tasks to contacts for follow-up.
Maps and Navigation:

Addresses stored in contacts can be directly opened in mapping turkey phone number list applications for navigation.
Caller ID and Spam Blocking Apps:

Apps like Truecaller or built-in phone features use your contact list to identify incoming calls (showing the contact's name) and may also contribute to crowdsourced databases for identifying spam or unknown numbers.