Contacts lost after update

Contacts are neither stored locally on an iPhone nor in SIM. They are synced to an email account that you had Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other

If Contacts on iCloud, try this --> Restore contacts, calendars, bookmarks and more using ...

1. How many Contacts account (email client server) you have?
2. What is your default Contacts Account?
3. Which email account you are using to store Contacts?

• See the GIF below for Contacts and Default Account

• Learn how to add an email account and make it default (Watch the GIF)
• This example is for Gmail but the process remains same for all Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other

I suggest you use only one email account for contacts. They can play one against another.

If they are not in any of the accounts when you select them singly they are lost .

You ought to export contacts to a file on your computer for backup

Contacts are usually stored in one of your email accounts.

Check settings, Contacts, Accounts.

See which accounts are turned on for contacts.