IOS is getting the time using the IP network which is above the CDMA or WiFi level. It polls an NTP server just frequently enough to keep the system clock to within "a few seconds" of correct time.
I could run the full NTP but doesn't because that would drain the battery to fast. Background tasks mean the CPU can't go into sleep mode. The phone has the GPS receiver too and I'm a little surprised they don't get the time from GPS. But it is all about battery life and there is no need to run the GPS if the phone is not moving. On Sun, Aug 3, 2014 at 1:37 PM, Brian Garrett <garrettbrian1...@gmail.com> wrote: > Hi all, > > First “time”r here. This may not rank up there with your degree of > time-nuttery, but I haven’t been able to get an answer elsewhere. Recently I > was discussing the issue of how the different cellular providers set their > time, and I told him that I’d read that CDMA phones and towers have to have > their clocks synced to GPS as part of the protocol, -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
