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On iPhone and iPad you may have given Contaxo access to selected contacts only. In Contaxo, open Settings › Access & Privacy and tap Allow Full Access (or in the iPhone Settings app go to Apps › Contaxo › Contacts and choose Full Access). Backups and restores need full access to see every contact.

The free version exports the first contacts of your list (see Pricing). Filter the list first, for example to one group, or upgrade to Pro to export everything.

On iPhone and iPad, backups are in your iCloud Drive, in the app's own folder, so they survive deleting the app. If iCloud is off, they are kept on the device and moved to iCloud Drive later. On Android, backups are saved on the phone; use Share backup to keep a copy in Google Drive or Files.

Restore only adds contacts that are missing. If every contact in the backup is already in your address book, there is nothing to add and the app tells you so.

Save it as .xlsx or .csv and try again. Numbers and OpenDocument files need to be exported as Excel or CSV first, and password-protected workbooks must be unlocked. Files with more than 5 contacts need Pro.

Contaxo writes CSV files in UTF-8. If Excel shows broken accents or non-Latin letters, open Excel, choose Data › From Text/CSV and pick UTF-8 (65001) as the file origin. Or export to Excel (.xlsx) instead, which keeps every character.

For your security each QR code works for 30 minutes and for one phone. On the old phone, create a new QR code and scan it again. If the short codes on the two phones are different, the transfer stops and nothing is shared.

Open Contaxo on the new phone again. Contacts you chose to save later are kept on the phone, encrypted, for 7 days.

Tap Undo in the message that appears right after the change. Later, open Backup Contacts and restore the restore point that was saved before the change.

In the app, open Settings and tap Restore Purchases, signed in with the same Apple Account or Google account you used to buy.