Below you will find the technical specifications for messaging, including Content-Length, Maximum File Size, and File Types, and other policy information.
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Message Content-LengthUCS-2 (16 bit) = 70 character maximum. For longer multi-part messages, a user data header  (UDH) is added to the message to instruct the receiving device on how to reassemble the message, resulting in a maximum of 67 characters for the body of the message. Latin1 (8 bit) = 140 character maximum. For longer multi-part messages, a user data header  (UDH) is added to the message to instruct the receiving device on how to reassemble the message, resulting in a maximum of 134 characters for the body of the message. GSM7 (7 bit) = 160 character maximum. For longer multi-part messages, a user data header  (UDH) is added to the message to instruct the receiving device on how to reassemble the message, resulting in a maximum of 153 characters for the body of the message. Any message segment which has been broken up from a single message due to length will be treated as a single message as will messages to multiple recipients.MMS Specific Policies Maximum file size: Operators support different maximum file attachment sizes. Files of 2MB or less will be resized to the appropriate destination operator-defined limit. AT&T supports up to  1.2MB for transcoding to user handsets. Files over 2MB are not supported and will be rejected. File types: Currently supported file types are listed below. File types outside of this list are not supported and will be rejected.File TypeExtensionaudio/3gpp.3gpaudio/amr.amraudio/amr.3gaaudio/mp4.m4aaudio/mp4.m4paudio/mp4.m4baudio/mp4.m4raudio/mpeg.mp3audio/wav.wavimage/bmp.bmpimage/bmp.dibimage/gif.gifimage/jpeg.jpgimage/jpeg.jpegimage/png.pngvideo/3gpp.3gpvideo/h263.h263video/h264.h264video/mp4.mp4video/mp4.m4v