Is it possible to synchronize the Simple CRM calendar with an iPhone / iPad?

Yes this function exists and is very appreciated, since your phone/tablet rings to remind you of your appointments.

In addition, the Simple CRM calendar automatically adds a series of very practical information to the
 calendars of your phones/tablets: Location of the appointment (with interactive link to Google Maps), Company name, First and last name of the contact person, Telephone details (a click allows
you to launch the call from your mobile phone), Email details (a click allows you to write an e-mail),
A link to the Simple CRM appointment form in order to be able to edit the Interaction directly (as for
example to add comments after the appointment).

To learn how to set up synchronization, please read the explanations on: http://www.simple-crm.online/2018/04/integrate-simple-crm-calendar-into.html