I am connected to PM 4G with this phone. My talk and text worked only on 3g with no data when I first tied my sim, but I found the fix was to manually enter PM's Access Point Name data. Now I have fast data on 4g.
I had this issue when moving my sim from an old iphone that had data on PM's network to a new UMIDIGI F1 Play with android. The new phone had calls and text on 3g but not cellular data. Funny thing when I looked at "Access point names" it had only ...