The Ins and Outs of PC Audio Jack Colors. In many cards, the microphone connector will be pink, the line out or headphone will. be lime green, and the stereo line in will be light blue. Additional jacks may be present. on newer soundcards for rear and mid surround speakers. There is a widely accepted color standard for computer sound card input and output.
If one of the key features of Wi-Fi calling is that you can start/receive a call while on Wi-Fi and it will hand off to the cell network in a seamless fashion, that might not be true for some iPhone 5 users on T-Mobile.
But, if you own an iPhone, you actually can do a 3 way conference call or even multiple conferencing call. You can do it by placing a normal call. Then once the call is pick up, you can select the Add Call button to make another call while the person that you are currently communicating is still on the line.