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Hello everybody, I am monitoring a status of a sensor interfaced to P89V51RD2(8 bit controller)and want to send a SMS to any mobile number fed into the controller.But i am not getting the GSM modems in which i will insert a sim card and can be interfaced to my board.Can anybody of u provide me some links or Lists of GSM modems which can be selected for this purpose. Thankyou Regards Sagar
Such a list would be very long - especially since there are a huge number of obsolete models out there, that can be had for a low cost, but isn't suitable for mass-production.
Most mobile phone manufactureras (and a number of other manufacturers) produces GSM modules for embedded usage, i.e. supposed mount directly on a PCB. They normally interface with a uC using a TTL-level serial interface or USB.
Besides that, all better mobile phones may be used as GSM modems with a suitable adapter cable.
Contact one of the distributors for the major brands, and don't forget that you also need to get the required documentation of the command set.
"Can anybody of u provide me some links or Lists of GSM modems which can be selected for this purpose."
Trying to keep such a list up-to-date would be a thankless and, probably, fruitless task.
Just use your normal internet search engine, and search for "GSM modem". Also try "embedded GSM modem".
Then narrow the results down to the ones that available in your locality, and meet any other specific requirements that you may have.