> As far as I know, this is still what push notifications are built upon for an idle/sleeping device. I thought so too, but can't find any evidence for it anym

> As far as I know, this is still what push notifications are built upon for an idle/sleeping device. I thought so too, but can't find any evidence for it anymore, all I can find is mentions of the phone keeping a TCP connection alive and then some device driver level tweaks to make that power efficient. I think the older GSM-specific wakeup mechanism might have died when iPhones stopped being carrier-specific.