How does address-book sync work?

Short answer

On iPhone and Android, Nexicall keeps its contacts in step with your phone's own address book in both directions. A contact you add in Nexicall turns up on your phone, and a number you save on your phone reaches Nexicall. Several numbers per person are kept with their types, and deleting on one side never silently deletes on the other.

What syncs, and in which direction

Names, phone numbers and postal addresses sync both ways between Nexicall and the address book on your phone. Someone with a mobile, a landline and a fax keeps all three with their types intact — which matters, because Nexicall will not offer a fax number as something to call or message. Sync runs when the app starts and when your connection changes, rather than continuously. Opening Nexicall is the reliable way to bring both sides up to date. The web app does not touch your address book at all. This is a phone feature, because only the phone has an address book to sync with.

What happens when both sides changed

If the same person changed in Nexicall and on your phone since the last sync, Nexicall merges the two versions rather than picking a winner and discarding the other. Where a genuine conflict cannot be merged, it is written down instead of being resolved silently. This is deliberately cautious. With contact sync, the failure that matters is not a duplicate you can see and delete — it is a number that quietly disappears.

Deletions are never automatic

Removing a contact from your phone does not delete it from Nexicall. It is archived, so the call history and notes attached to that person survive. We are strict about this because we have been on the wrong side of it. A sync bug once read “this contact is no longer in the phone's Nexicall group” as “the user deleted this contact” and archived a real customer list. Nothing was lost, precisely because a deletion is an archive here rather than a deletion — and the sync now confirms each contact individually and refuses to act on an implausibly large batch at all.

Related questions

Will this fill my phone with contacts I don't want?
Only contacts that exist in Nexicall are written to your phone. On Android they sit under their own Nexicall account, so you can see at a glance which entries came from the CRM and hide them in your phone's contacts app if you prefer.
Does this need a special permission?
It needs access to your contacts, which your phone asks for the first time sync runs. Nothing is read or written before you allow it, and you can withdraw it in your phone's settings at any time.
Does this sync with Google Contacts or iCloud?
This article is about your phone's own address book, which is what Nexicall syncs with directly. If that address book is itself backed by a Google or iCloud account, changes reach the account the same way any other change made on your phone does.

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