Using WTK you can develop applications that will reside on mobile phone. That means the SMS/MMS application is for the mobile phone. What I want is to develop an application that will reside on the PC and should be able to send and receive MMS/SMS to the cellphones.   I had used SMSLib earlier for sending and receiving SMS by connecting my cellphone as a GSM modem to my PC.  The only problem with SMSLib is that it doesn't provide the capability to send MMS  and I am not sure if performance wise it is that good.    
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