no subject messages

i received no subject messages from twitter, vision express and some off my contacts and they wont open i have a huawei y6 2018 fone on giff gaff i have manually installed the mms/internet settings as told to. to see if that would work i have factory reset my phone and still that didnt work i even read that if u have the hangouts app that could be the problem but ive not got hangouts i even paid £5 pounds for a live chat on a site with a technical guru and tried every thing he said but it didnt work i do know that some of the no subject messages from my contacts are mms/picture messages im running on android 8.0.0 which was a new software update it was even suggested after factory reset to get some one to send a picture message on the android version the fone had when it left the factory but that didnt work does anyone know how to fix this problem please

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