Restore contacts for iphone?

Need help please.
I broke my iphone 4and have had to buy a replacement, when i tried to restore my contacts i accidentally hit back up on my new phone and now can't find all my old contacts. Is it possible to still find them or will they now have all been erased and replace with basically nothing as new iphone was blank.
Is i still possile to recover the previous contacts i had backed up from my broken iphone.
Any help be very ery appreciated.

Copy to SIM first then restore contacts

I need to restore all contacts to my phone

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