The only way to really do this is through bt tethering. Wifi hoping is not really a solution because while moving about your daily business you can easily move out of range of all wifi spots. For example, driving home from work you will most likely not have continuous internet.

However, if you bt tether and leave a web page open (to prevent the automatic time-out some carriers have) you can maintain an internet connection as long as you have a cellular connection (much more ubiquitous than wifi and can be sustained while driving home) and battery power.