I am writing this so that others that enconter the same problem that I had with my 4G may benefit from my arduous experience and probably save some time. I live in Dallas. For about 1 week, my 4G will connect and disconnect. At first, I thought maybe it was a network problem, but then, nobody in Dallas is complaining on the forums, so I ruled that one out and set to work on my darling phone. Researched all the threads in several forums. I did not try most of the suggestions because I did not want to do anything too invasive. The sequence of steps to get to my resolution are in the attachment. I do not know why step 11 worked while 9 did not, but I am just happy to have 4G back!