How does iOS4 determine the time?

I've seen several topics but no resolution. What I thought initially was a Telus (Canada) thing, I've instead come to realize it must be a iPhone or iOS4 thing ...
That is, my new iPhone 4 was born 45 seconds ahead of accurate time, and it has since lost ~1 sec per day and is now 13 sec behind. I've just been around the world, and it cannot be a Telus (or any carrier) problem because I've employed pre-paid SIMs in Jo'berg (Vodacom) and in Brisbane (Optus), to return to Canada, re-insert the Telsus SIM, and the clock never changed ('cept to change relative to the local time zone).
It's ironic that I forsake an accurate wrist watch in lieu of the extra $$ for the quality the iPhone generally represents. There are clock apps that will show me accurate time via network time servers (eg, Emerald-Sequoia), but iOS4 (and Apple) disallows 3rd-party synchronization ... which is reasonable, but why doesn't Apple create and use a similar app for providing accurate time?
40 seconds, or where (when?) my iPhone will eventually end up are not trivial -- even to be 5 seconds off should be an embarrassment for Apple in this day&age. In what time zone will my iPhone eventually end? I simply do not get it??
my CA$0.02
Cheerios from the Avalon Peninsula

Graham Outterside wrote:
As I said elsewhere in another thread, on Monday, at Canning Town station, the cell clock was literally hours out and as soon as I changed cell at London City Airport a couple of stations down the track, it was back to normal.
Hmmmm ... all seems plausible. Please explain " ...as soon as I changed cell at London City Airport a couple of stations down the track ..." relative the plausibility of my swapping SIMs twice in 2 different counties, on both sides of the IDL, then to return to Canada, in a location other than my home, and still have the minute+second hands in the same place(?)
Thanx for your enlightenment

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