Is there a way to know the ppm of the clock oscillator in a smartphone?
For example, in the Android documentation on System Clock, there is a function elapsedRealtimeNanos, which guarantees a monotonic clock. However, I would like to know how much drift may occur when compared to an atomic clock. Even using NTP won't reveal any intuition on what is an expected amount of drift given the current hardware in phones.
If it's possible, can you share where you found the ppm information and how to calculate the error (in seconds) after x seconds have passed?