In the novels, they make a big deal about devices not being able to access the matrix at all in low rent areas (Chicago tunnels, the barrens, et al). However, when you are looking at ratings, Even a corporate drone can barely access it with half of the devices out there taking into consideration Noise, Spam, and Static. Public grid, raining, steel building in City Downtown, during an advertising blitz? -6 hit penalty needing 18d6 (1:3) to get net 0. Subscribed grid? -4, 12d6 in less than ideal situations.
How many dice would a normal schlub get? Probably 4 (1 skill, 3 logic). Everybody makes a big deal about the future being wireless, but regular usage might as well require you be plugged into something wired.