Hi,

Since the description is quite simple, I need to know more details about the issue:

1. Are you using Outlook?

2. If you are using Outlook, what type of account is it in Outlook?

3. Are you using the same account on your phone to sync contacts with Outlook?

Basically if the contacts in Outlook don't disappear, then the issue is probably on the phone configuration, since I'm not familiar with it, maybe you can contact the support of your phone for further troubleshooting steps.

Regards,

Melon Chen
TechNet Community Su