Image Upload Anonymously via Sandbox

Hi I need to upload an image in list anonymously using the sandbox solution is there any way to do.
I have 3 fields (Name[string] , Phone[int] , Picture[Attachment])
i can insert Name and Phone anonymously but how do i upload the attatchment.

Please help

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Regards, Syed Asad Email : syed.asad@msn.com Skype : sautaimoor Facebook : sautaimoor Linked In : sautaimoor