There's definitely some variability based on location. I've used my phone in various places around the Midwest. Usually, it's pretty good. Last time I was on I

There's definitely some variability based on location. I've used my phone in various places around the Midwest. Usually, it's pretty good. Last time I was on I-65 between Chicago and Indianapolis, it went haywire. Regularly claimed I was out in west Illinois near Decatur. (A friend of mine reported similar behavior.) Other than that, it's pretty solid. I haven't really paid too much attention to how off it is, usually it seems to manage at least 30 meters without a problem.