[Steve_Seattle]

“If Muslim students at UCLA can’t figure out how to tell time or keep track of when they need to pray, that’s their problem.”

That's correct. The public call to prayer dates from a time when people did not have watches or any easy way of accurately tracking time, so the task was in the hands of professionals who - some way or the other - did it for the community as a whole.

[reg45]

I just checked the App Store and there are multiple apps for indicating the Muslim prayer times on iOS devices. I am certain that there are also multiple Android apps for the same purpose.