I lost my iPhone, how do I get my contacts back?

I lost my iPhone, and I urgently need someone's number. I've tried a few programs but none of them are giving me this specific person's number. Does anyone have any ideas on how I can get it?

Added (1). IT'S OKAY! I USED ICLOUD AND GOT THEM ALL! Thanks for your help! Even tho none of you suggested iCloud…

The company your under should help you with that

If you synced it into your computer then when you get a new one or it back you restore it from your backup and it will have all your contacts back on the phone

You don't have them written down?

Verizon has backup assisstant and that's how I get my contacts.

Acttually i lost my phone so i just want to get my contact back but i have not remember my cloud id so how can i get back it please help

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