I have an iPhone SE2 and am on the $30 monthly plan. My friend has tried to send a video multiple times from his Android phone to me but I never receive it. He has sent the same video to many people with no problem, some on Verizon some with other carriers. I have received other videos from him that were smaller but this one (15 MB) does not go through. Why would I not receive it and everyone else does?
Not sure if this will help, but my daughter has a Samsung phone & I have an iPhone and I just fumbled around and made a change that worked for us. Under Settings, go into Messages. Under SMS/MMS do you have MMS messages turned on? I think that’s what worked for mine (but I could be wrong 🤷🏼♀️).