We trust folks frequenting Engadget Mobile don't fall into this category (do they?), but for the 4.7 million Cingular customers soldiering on with legacy AMPS and TDMA hardware, the pressure to upgrade is about to get kicked up a notch. Starting next month this, uh, very special contingent of users will find a new $4.99 monthly charge on their bill, having committed no crime other than failing to make the switch to GSM. What's more, Cingular seems to be offering little or no incentive for folks hoping to avoid the surcharge by getting a new handset, saying only that "some customers will qualify for discounts on their new phones." If anyone was still in doubt that Cingular was thumbing their nose at their pending TDMA class action suit, this pretty much seals the deal.
[Thanks, BeeRT and Tim UF]