Can the calendar sync to an IPhone both ways?

The sync is only 1 way. You subscribe to your MTH calendar through a calendar program like Yahoo, Google, or iCal . Any changes must be made from MTH. You can sync to an Android if you uses the Yahoo or Google calendar. You can then set up the calendar to sync with your phone.

Apple has an internal sync on the iPhone. When you open the calendar, it pops up asking "Do you want to sync this calendar?" This sync will not work because we do not support it. The iPhone needs to be synced via another calendar like Google Calendar, Yahoo, or a Mac computer. You can subscribe to MTH from these calendars, and then sync the calendar to your Android or iPhone.

To sync Yahoo/Google to Android: https://support.google.com/mail/topic/2451697?hl=en&ref_topic=2451730

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