I'm having real trouble with my Google-fu today, for some reason, but anyway...I need to get a GSM modem for a server I'm running (in the US). It needs to connect via the serial port (i.e. not USB ...

Diversenet can be used to monitor both remote and metropolitan equipment as well as to send notifications and alarms via SMS, right to a cell phone. The modem operates in an extended temperature range ...

You can save yourself money by leaving your SIM card at home and using a GSM-to-Skype bridge to take calls on your phone via WiFi. [Trax] is using a USB GSM modem to take cellphone calls on a PC.