Q: airdrop, screenshare question

hi..

i have MBPr 2012 with Mountain Lion and NewMacPro 2014 with Yosemite, and iphone6.

i want to share these via airdrop and screenshareing.

first, never worked MBPr and iphone6 via airdrop. i can't see my phone icon in airdrop window.

second, i can't enable screenshare with MBPr and NMP outside of my home. this has been done before NMP upgrade to Yosemite.

what should i do?

thanks