Is it possible to synchronize Simple CRM contacts with an iPhone?

There are two methods: first the manual method. You only download the VCARD of contacts that interest you.

Then the automatic synchronization method, which synchronizes everything. For this, please read
 the documentation on http://www.simple-crm.online/search/label/Synchronization

Practical detail: if you activate calendar synchronization on your iPhone, you will find directly in the
calendar the address (with active Google Map link), phone number and e-mail of the person with
whom you have an appointment. This is an automatic synchronization based on the appointments in
your calendar.