If you're not using a major online service provider, you can still set up and use any standards-based email, calendar, and/or contacts service you like, including your own!
First of all, you need to copy your personal URL link from Teamgate "My profile" settings section "Integrations".
Then, please follow these steps:
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Open the Settings app.
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Tap Mail, Contacts, Calendars.
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Tap Add Account.
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Tap Other.
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Select the account you wish to configure.
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Enter your service information. If you don't know it off-hand, you'll need to get it from a system administrator or whoever runs your CalDAV, account.
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Tap the Next button in the upper right-hand corner, and your device will verify the account.
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If everything looks right, tap on Done. Your account will now start syncing with your iPhone, iPad, or iPod touch.
Note: Sometimes you need to go back to Advanced settings and check if your saved CalDAV link is correct.