How do you unblock a contact on your MacBook Air?

I blocked a contact on my iphone yesterday, today my iphone broke and my screen is completely blue. I'm afraid my contacts and everything else will not be retrieved because I did not back my phone up, because I did not have enough room. I do not want this contact blocked and I do not want to have to change my phone number if this contact would continue to stay blocked due being unable to unblock them. I'm hoping there is a way to do unblock them on from my MacBook Air. Any help is greatly appreciated.