hi,
Sim card and mms works on kyocera android 4.4.2 but don’t on s7 /e/. I try to install a custom rom samsung (i root it) and mms work. I think /e/ ( or something) not registrer operator network (for my example “Orange F”). And my kyocera and s7 custom rom, i see Orange F and mms work directly. I remember that i had a error message at startup /e/ that operator Orange F is’nt available. For now i use the custom rom and wait some update on /e/ to re-install in a futur.