You always have to open any application to work on it. The push version would simply notify you when an incoming call was coming in, and open the app accordingly. Yes, there will be a delay to open the app and connect but I doubt it would be more than the latency on existing cellular calls.
The real pain comes when trying to replace the existing background app: ipod. Being able to listen to streaming music is worthless unless you can send an email whilst doing so. Also, GPS apps take a while to get a lock and this would be another example of where backgrounding is useful.
“Microsoft's not promising the world with Windows Mobile 6.5, nor are they delivering it -- it's very much a stopgap, complete with duct tape, bubble gum, and Bondo.”
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You always have to open any application to work on it. The push version would simply notify you when an incoming call was coming in, and open the app accordingly. Yes, there will be a delay to open the app and connect but I doubt it would be more than the latency on existing cellular calls.
The real pain comes when trying to replace the existing background app: ipod. Being able to listen to streaming music is worthless unless you can send an email whilst doing so. Also, GPS apps take a while to get a lock and this would be another example of where backgrounding is useful.