The MMS option in iOS5 settings

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Hey guys, I send a lot of iMessages and most of the times they include an image.

However sometimes of it fails then it'll send it as an mms (as I have "send SMS is iMessage unavailable).

My question is. If I turn off MMS in the settings; can I still receive other peoples mms's (as that's free anyway) or does it block incoming and outgoing mms's.

Thanks for any answer

 

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So if someone sends me an SMS do I get a text message saying they tried to send an mms? Or does it get lost in cyber space with them paying for an mms and expecting a reply

Thanks for the help .?

 

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Because if the iMessage with picture fails.....it will surely send my picture as an MMS and thus charge me 50p per message which would be quite a surprise on my bill lol