I am working on sms controlling of device i need to interface GSm device to 8051, which GSM modem i should use for the same and how should i make connections
Take a look at Wavecom: their "Open-AT" allows you to embed your application directly into the modem or module - without the need for a separate, external controller: http://www.wavecom.com/openat
Or Telit have a module with an embedded ARM processor exclusively dedicated to customer applications: www.telit.com/.../gsm-gprs.php