Official SMS of mobile phone number

I think we should see what kind of friends they are. If they have a good time, just say "I'm happy" ... my mobile phone number is now ... save it. If you are an ordinary colleague, "Hello, I am ... because ... I want to change my mobile phone number to ... Please save it, thank you". If they are my relatives and friends, "Hi, how are you recently? I'm ... my mobile phone number.