Lost all my contacts

[AC Question]

How can I get them back

 

[Ry]

How can I get them back

What phone?

Were you syncing to Google?

https://contacts.google.com

 

[Rukbat]

Assuming that they were all entered as Google account contacts, they'll be at contacts.google, but if they were entered as Phone, Device or SIM contacts, they don't get synced. (Which is why all contacts should be entered as Google account contacts.)