Alltel MMS help

[caporx]

Alright. I have a sprint touch. Unlocked it, using it on my alltel account. I've come to find out that I cant do ##000000 or ##778 when on an alltel rom tho. So i'm currently on nfsfan's newest sprint rom. I downloaded lennySH's cab for alltel MMS. I can send messages fine, but when someone tries to send me one, it starts doing some sprint vision thing an gives me error 1020.
Is there a way I can receive my MMS? only reason im stayin on this rom is bc it allows me to access my MSL menu. if anyone knows how and/or why alltel roms wont let me in to MSL menu that would be helpful too.