If you are the owner of and Android or iPhone, there are high chance that you already have Google or iCloud accounts. So, what are the main advantages of having those phones and accounts? Some are :

1. To save your phone numbers on the cloud – no more asking on Facebook for your friend contact numbers in the case of stolen/lost/broken phone
2. To save your pictures and precious memory or event in the case of corrupted phone or memory card – Google provide unlimited storage for this

So please, my dear friend, backup your contact number on the cloud and stop embarrassing yourself asking for your friend to resend their contact number to you, when in your hand is a (or two) intelligent device that can do what is written here.

Reference: How to Transfer Phone Numbers on an Android to Gmail