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.
The iPhone 5 was the first model to support LTE and all models newer than the iPhone 5 support LTE. The iPhone models prior to the iPhone 5 do not support LTE. The iPhone 4s supports HSPA, which some cellular carriers call 4G.