Why are some MMS messages not coming through at all?

[ebald009]

Recently on my Android device my friend would send me a MMS message, but I will never receive it it never comes through not even after I shut off my phone later in the day nothing it just never comes through no sign of it. the weird part is that it shows that it has been delivered on his device. sometimes they come through sometimes they don't. Is there reasoning for this especially if they never come through?

 

[ManiacJoe]

Which phone?
Which version of android?
Which carrier?
Which texting app?