I think Chicago has great Mobitex coverage, last time I visited with my old 950 --

But GSM 850 Mhz blows away Mobitex in Southern Ontario! (Mobitex is an equally-penetrating 900 Mhz, and the other GSM band 1900 Mhz is less-penetrating). The new 850 Mhz network got deployed November 2003 and Mobitex holds no candle to it anymore. Southern Ontario is like one big WiFi hotspot now even 2-3 hours of driving outside of cities. Airplane coverage is another story, but airlines say it's a big no-no... :D