Sharing calendars and or contacts with Android
On Android, install the DAVx⁵ software. The app is available both through Google Play or through F-Droid
If you have already installed the Nextcloud app to sync files with your mobile device, DAVx⁵ can be configured from right from inside it.
If you choose not to install the Nextcloud app, you can still sync Nextcloud calendars and contacts with your device by creating an account from within the DAVx⁵ app. You can simply enter the URL: https://share.mayfirst.org/ and DAVx⁵ will prompt your to sync either contacts, calendar or both.
Synchronizing with iOS
Your calendar will now be visible in the Calendar application.
You should now find your contacts in the address book of your iPhone.