IPhone 4 help! Can't send MMS?

I just got a iPhone 4 for my birthday last week and I can't send picture messages. The iPhone is through Virgin Mobile and its brand new. I have unlimited Data + Messaging. When my mom send me a picture I receive it just fine but when I try to send her a picture it shows it delivers and makes the little sent noise but she never receives it (She has a Samsung Galaxy II with Virgin Mobile same plan as I do). My friend who has a iPhone 4s with Sprint receives my pictures. I just tried to send my grandma a picture (non smart phone w/verizon) and she didn't receive it either. CAN SOMEONE Please Help ME? I send pictures a lot.well i try to. But it don't work

Make sure the phones you use for both contacts (both sender and receiver) has cellular data and MMS turned on on their phones. Otherwise, the phone will restrict some of the functionality of MMS.

If, for this situation, both phones have MMS and Cellular enabled, then this is no longer an issue with the phones, but with the mobile providers. There might be MMS limitations with the phone plans other people are using.

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