AT&T’s competitors are making pitches to WiFi-only iPad users, hoping to capitalize on years of complaints about the speed of AT&T’s “overloaded” 3G network. Verizon is pushing its MiFi mobile hotspot to iPad owners, and now Sprint is getting into the game, offering a snazzy carrying case called the Sprint 4G Case for iPad that allows you to tote your tablet plus Sprint’s Overdrive: a 3G/4G (if you consider WiMAX “4G”) portable WiFi access point, for what the carrier promises is “way, way faster” data service in 27 cities in the US.

Sprint executives told Forbes earlier this year that they saw devices like the iPad as a “Trojan horse” for their high-speed wireless network. Paget Alves, Sprint’s president of Business Markets, said he hoped that people who want to “have the same experience as in Starbucks” while on the go would be willing to buy the Overdrive for $100 and pay $60 a month for data. They have a hard sell, though. Though the 3G version of the iPad will be about $130 more than the WiFi-only model, data charges are just $15 per month for up to 250 MB and $30 per month for unlimited amount of data, while both competitor’s plans have data caps. Also Sprint’s deal, like Verizon’s, requires two-year commitments while the AT&T plan is month-to-month.