Does an iPhone require data to send group mms?

I have an iPhone on ios 6.1 and I seem to e missing parts of group texts, and even receiving them up to a day later. I recently updated from ios 5, and before I used to be able to use group messages using only Wi-Fi (I turn my 3G off at home and only use Wi-Fi). Now when I'm only on Wi-Fi I'm missing group messages, but when I turn my data on I will get tons of messages. Is this something new that requires data to use group messages?

Added (1). Why could I previously get group messages using only Wi-Fi but now I can't?

It requires that data be enabled on the phone to send mms messages, either group or single messages. MMS uses data. On verizon, it doesn't go against your data plan though. Go to settings, general, cellular, to make sure that data is enabled. Hope this helps!

Ios 6 requires a data plan to mms

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