Yosemite share internet via wifi I am using internet via wifi connection. Now I want to share my internet with my iphone. In the preferences, I found the option Internet Sharing, but there is no "wifi" option under "To computers using:". "Only ZTE WCDMA Tech" and "Thunderbolt Bridge".

What to do?
You can not bridge from WiFi to WiFi. You'll have to connect to the internet via a different port if you want to share the connection. I'm assuming the reason you don't connect to the network directly with your iPhone is some kind of client limit. You could use a Wireless Router to connect to the WiFi and repeat and reroute it. If you use an Apple Airport make sure you disable bridge mode.