I've been reading the many posts about people not being able to retrieve their Yahoo mail or Yahoo mail accounts. It's happening on enough different phones that it's obvious it's a Verizon or Yahoo issue, and not something any of us did with our individual phones. If we want to get things fixed, my recommendations for everyone affected are:
1. Go to the Verizon Wireless Facebook page and post message about Yahoo Mail, and that it needs to be fixed.
2. If you're a Twitter user, post a message in your status about Yahoo Mail not working on @VerizonWireless. Also include the hashtag #VerizonWireless.
Maybe this way we'll get their attention and they'll see there's a big problem with Yahoo Mail and put some resources on the problem.
Verizon wouldn't have anything to do with an app-specific problem. Verizon is only a service provider. It's either a Yahoo problem (that's where I'd place my bet), or a Google problem, since they're the ones making the operating system. More than anything, it's probably just poor development on the part of the Yahoo team.
A better question to be asking is why are you still using Yahoo? You have a Google phone; you're going to get the best reliability when you couple that with Google services.