I am using my N900 on EDGE due to Canada not having the correct 3G frequency for the N900. When I am connected to EDGE, and a cellular calls comes in, I get the yellow banner at the top of the screen saying "cellular data not available", and my data connection suspends for the duration of the cellular call. I am not sure if this is a N900 specific behaviour, or if it is a 'feature' of EDGE.