Such bs this problem.
Phone Info no long has the ability to switch to 3g.
I am super pissed because my phone was always on the 3g setting, but after a recent automatic update it switched to 4g.
I realize this is an old thread,
But I am desperate for a solution
???
I've attached the PhoneInfo app file from my phone that still works for me. If you download and install it, you'll be able to turn off LTE.