9/17/2008 When the OS boots, it checks the system registry for the following key:
HKEY_CURRENT_USER\Software\Microsoft\SMS\TextShared
This key contains a flag that specifies whether EMS processing is enabled on the device. EMS processing is disabled by default, however, you can enable this support yourself.
To enable EMS processing support:
EMS is defined in 3GPP Technical Specification 23.040 "Technical realization of Short Message Service (SMS)". It can be obtained from this website http://www.3gpp.org/ftp/Specs/html-info/23040.htm.
Concepts
Short Message Service (SMS) API
Other Resources
IMessageFormEx
IFormProviderEx