How to get back lost data on iphone?

I restored my phone and after it was done, there was no data left on my phone. It deleted everything.
Now I need to get back my contacts and photos but I didn't do a backup before I lost them so how do I get 'em back?
It is really important.

Unless you have another backup somewhere there's no way to do so. Contacts, depending on which service you used for email & assuming they were there as well should be a matter of signing back into the account.

Either you backed it up or you didn't. If you didn't then you get a good learning experience from it because everything is gone.

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