I have a galaxy note 10 plus and resently paid the phone off and broke contract with att. I have since bought a straight talk sim card and put it into the phone. Shortly after doing so i noticed i could not send or receive multimedia messages. Ive been trying to figure it out for a couple days now and ive put in every variation of mms apn for the network and none worked. Go into phone setting and it says ims registration status is not registered. Perhaps this has something to do with my mms not working. Im not sure....can someone please point me in the right direction.