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Re:Battery life: Apple's solving for x by PanMan on Tuesday January 13, 2015 @06:51AM (#8879195)
GSM networks ping all devices on regular intervals (besides the handoffs between cells when traveling and when there is data to transmit). This interval is a setting of your network, from minutes to hours.
Re:Battery life: Apple's solving for x by kabouseng on Tuesday January 13, 2015 @07:04AM (#8879242)
Thanks PanMan,

I suspected something like this.