AT&T’s occasionally janky 3G coverage has become a generally acknowledged thorn-in-the-side for iPhone users, but the carrier still isn’t pleased that arch-rival Verizon Wireless have called them on it.  Verizon’s “There’s a map for that” adverts compare AT&T’s 3G network with their own, an act which the latter claims is “misleading” and – as you’d imagine was Verizon’s intention, really – has caused them to lose “incalculable market share”.  While subscribers would be happy with AT&T deciding to fill in those gaps, the carrier has taken the easier option and filed a lawsuit against Verizon.

The real issue is how Verizon have chosen to detail coverage in their mapping, focusing only on 3G areas and making no indication of non-3G areas.  That, the carrier insists, is the point of the advert – which you can see below – in that it focusses on why their network is good for high-speed data services such as streaming video.

AT&T, though, reckon that the ads have “stepped over the line of legitimate comparative advertising” by not making clear that just because their