I have a Verizon Galaxy S4 unlocked and using it on AT&T. (I used an activated micro SIM card out of an iPhone 4) I changed the setting for the APN according to the AT&T website.
Everything works so far except I can not turn on my mobil hotspot. When I try to turn it on I get the message "Mobil number not found". What can I do if anything. Thank you.