HT1666: iOS: Sending and receiving emailsLearn about iOS: Sending and receiving emails
Currently Being ModeratedNov 4, 2012 6:51 PM (in response to inzspot)
Be sure you turn on the carrier's network. Check it in: Settings>>Mobile, and then turn on Cellular Data, Active 3G and Roaming.
You also must to set the Mobile Data networking according your carrier's plan, fill the blanks like MMSC, Proxy MMS and MMS size.
Hope it will be helpful