Don't worry, your iPhone is connected to the atomic clocks.

Atomic Clock FOCS-1 (Switzerland).
The primary frequency standard device, FOCS-1,
one of the most accurate devices for measuring time in the world
. It stands in a laboratory of the Swiss Federal Office of Metrology METAS in Bern.
Source

    The US Naval Observatory is home to a set of incredibly precise atomic clocks that record America's official time.Its clocks are relied upon for a vast range of functions, from providing the time on your smartphone lock screen to keeping GPS satellites accurate in their calculations. The clocks, and the service they provide, are presided over by Dr. Demetrios Matsakis, chief scientist for the observatory's time services department. Matsakis describes their importance and operation in a video interview with The Atlantic.

Original Article by Rich McCormick Here