Insufficient prepaid funds or mms blocked

    I've gotten a couple texts out of nowhere saying "insufficient prepaid funds or MMS blocked".

    Once I received one like that from one of my friends, but the next day he sent me a regular text and we had no problem texting back and forth. I got another "insufficient prepaid funds/blocked mms" message today from an unknown number in my area. I don't know if this message means that there's something wrong with my service or if it's the people texting me with the problem but I've had no problem with back and forth texts with other people in my contacts. Kind of confused and I think the people whose numbers I received this message from are trying to communicate with me but something's wrong with the service

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