Twenty Six countries are available. There are other technical aspects to consider before you can determine if your modem will function in a foreign country. First, if your modem is an external modem, you will need to check to see what voltage the electrical current is at the outlet. If your modem is internal, then the voltage at the outlet has to be considered for the entire computer system's voltage capabilities, and whether or not it is dual voltage, or running on a recharge system that is dual voltage. If the entire system is not dual voltage, then a transformer will be required to operate the system.
Modems can only operate on an analog system.
There are two devices that will enable a modem to operate on a digital system. One is an acoustic coupler to physically attach the handset to the modem. The other is a digital interface that plugs into the modem via the handset jack. Lastly, line noise is a problem that can occur in less modernized countries. Two things to try if this is a problem.