159 Views 1 Reply Latest reply: Mar 27, 2013 8:49 AM by razmee209
Ask your sister when she send you the MMS - is your name in blue or green?
IF it is blue - that means it is trying to send it as an imessage.
IF green - then it is sending it as MMS.
See if this link helps http://support.apple.com/kb/ts2755