I previously was able to making calls via wifi using the message+ app on my iPad. For some reason (havent updated to latest version of app), i get an error message stating unable to set up integrated calling at this time, try again later.  I didn't have a problem connecting before. This has been going on for over a month.  The app reviews at Apple Store have a lot of people complaining about this issue but no response from developers.  Yet when you go to Verizon's website, they still promote the capability prominently.  What is going on?