Follow-up to http://magree.blogspot.com/2016/01/erratic-cellular-data-settings.html.
I spent an hour or more pouring over postings in the Apple User Community looking for some solution to my long wait for cellular toggles to be activated in my iPhone. I finally found a link a user made to T-Mobile.
Quite simply a soft reset works. For how long, I know not.
A soft reset is to hold the on-off button and the home button until the screen goes blank and the Apple logo is shown again.
Why didn’t Apple offer this advice?