Within the last 2 days my call waiting is not working on my iPhone 4S. I am talking on the phone (rare these days, I know) and the chime sound comes in that someone else is calling me. I look at the screen and nothing is displayed and the toggle (switch) button to answer the other line does not display. The calls where from contacts that I have on my phone. I checked My Features online at my Verizon and it is still listed as a feature for my line. (I just switched to Shared plan From Grandfathered Unlimited two days before this problem started.
Any suggestions?