To connect to internet through mobile, mobile serves as a modem which modulates and demodulates data, you can use PC suite through data cable or bluetooth to connect to internet through mobile phone.
I don't know to get more speed on internet through GPRS. Using a broadbrand is good. But by connecting mobile hove PC. The speed of internet is the speed of internet in mobile. I don't know if new version of PC suite if use then some times the speed may increase. I don't thing so it will work. Because internet in mobile is by Kb But in internet in mobile is Mb.