I am trying to make a envoirment reporting system using AT89S52 microcontroller and Sony Ericsson T68i Mobile Phone as modem. I was successful in submitting envoirment data using SMS through AT commands. Now I want to submit my variables to the webserver using GPRS. Do I have to implement PPP, IP and application layers in my microcontroller? Are there any prebuilt examples available? -- Regards, Irfan