Hi everyone, I am wondering if anyone can help me with this weird issue that I have Googled around trying to solve but no luck.

Basically I need to update my APN settings (or at least I think thats the case). I can't get group messages and MMS messages don't work either, they both fail to retrieve and send. When I send one it says "Invalid Destination Address". I am using the stock SMS app that comes with GrapheneOS

My network is US Mobile so I went to their site to get the APN settings which I found but when updating them there are fields they have listed which are unavailable to me in the APN settings, namely MNC and MCC. Does anyone have an idea if what I could do? This isn't the end of the world, most people message me on chat apps but there is a work chat that I missed important messages in and I think its due to this. I appreciate any insight you guys may have.

    chance MCC is a number corresponding to the country your provider is based in, and MNC identifies the provider itself (when combined with MCC).

    They are both set automatically, you don't need to set them yourself.

        mrket Thanks for your response, so any idea what else it could be? I also see that some people are having the same issue on my network and fixed it by comtacting customer service so maybe that is my fix.

            chance Honestly you should just contact customer service, I work for a cellular provider and MMS not working is very common IME, and is almost always an issue on our end.

                mrket yea thats what I did and now its working, thank you.

                I'm wondering, prior to it breaking I never changed my settings, it just stopped working, I wonder what changed, maybe all the telecom companies implementing RCS screwed something up. Either way thanks again.