I have a ZTE 958 ZMAX phone running Android 6.0.1 (Marshmallow?) and am unable to send SMS Premium Messages to anyone with a numbered account (i.e. four, five, or six numbers). I have tried all the "Youtube Specialist" out there; Go to Settings>Apps>Messaging Permissions. Unfortunately, there is nothing in there where you can change the "SMS permissions". Anyone have any idea where I should look? Or know of a fix? Thanks!