My first experience of dealing with GSM modem was for an SMS gateway using Huawei E220 in which only a SIM card without a broadband Internet connection was used. I had tried several times in those days to connect to the Internet using SIM cards with a broadband Internet connection to no avail because I always got stuck when executing `sudo wvdial' in which fancy ASCII characters were displayed on the screen. I didn't pursue the solution because a GSM modem was still expensive and the 3G signal was weak at my place. But, this time I really needed to connect to the Internet using Prolink PHS100 GSM modem.