Your Nokia 3100 is equipped with an XHTML browser, you'll find it in Services menu. Browser is fully functional with both WAP and XHTML pages.

You can get the most out of it by using built-in GPRS connection your phone also includes. Just check the settings from section PC Suite how you can set the settings manually by yourself or use Nokia's Operator settings tool to get the settings to your phone over the air (OTA).