>I would think the capability of having an Off phone receive a radio signal to turn itself On would require pretty deliberate hardware design.
Wake on LAN (WoL) is a pretty common feature for network chipsets. I don't know anything about mobile networks (so take this as the semi-educated speculation that it is), but it wouldn't be a stretch to imagine WoL over 3G. It wouldn't have to be a feature advertised to end users of the SoC.
What it comes down to is "what does 'off' mean on a cell phone?"
Wake on LAN (WoL) is a pretty common feature for network chipsets. I don't know anything about mobile networks (so take this as the semi-educated speculation that it is), but it wouldn't be a stretch to imagine WoL over 3G. It wouldn't have to be a feature advertised to end users of the SoC.
What it comes down to is "what does 'off' mean on a cell phone?"