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.
Currently, T-Mobile has 27 smartphones that support this option. As for Sprint, Wi-Fi calling is available on a number of iPhone models that run iOS 9.1 or higher. Several Android devices have the service as well, but you'll need to check through your handset's Settings menu to see if you have it. AT&T offers Wi-Fi calling for eight handsets, while Verizon has 14 phone in its Wi-Fi lineup. T-Mobile and Sprint were the first major carriers to support Wi-Fi calling.