Missing contact info

Hi carhartt-golfer,

Welcome to Apple Support Communities. Since this does not happen while your iPhone is offline, it may be due to information syncing from another device. Do you use any other devices for contacts?

We'd recommend starting by checking to see which account these contacts are connected to. You can check that by going to the Contacts app, then Lists in the top lefthand corner. Tap each account individually to see the contacts contained there.

Then, check settings on each device to see which other devices use this email account for contacts. On Mac, you can find that from Contacts app > Contacts > Accounts. On iOS, go to Settings > Contacts > Accounts. Check to see where notes appear and do not appear for the Contacts.

Temporarily disable contacts for the accounts on other devices, then see if the same happens when your iPhone connects to the internet. Steps for Mac can be found in Add contacts from iCloud, Google, and more to Contacts on Mac.

"Temporarily stop using an account

1. In the Contacts app on your Mac, choose Contacts > Accounts to open Internet Accounts settings.
2. Select the account on the left, then deselect the Contacts checkbox on the right.

To see the contacts again, select the account’s checkbox to enable the account again."

On iOS/iPadOS, take these steps similar to those from Use other contact accounts on iPhone.

"Add contacts from another account

1. Go to Settings > Contacts > Accounts, then tap Add Account"
2. Turn off Contacts.

Take care.