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How broken would my jPhone be if I traveled back in time 24 hours?

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I have a character who ends up jumping backwards in time by 24 hours. Essentially nothing else changes, but the character has their jPhone in their pocket at the time of the jump. How functional should I expect this piece of modern tech to be after the time warp?

I assume that many applications will be perfectly functional- the phone's compass, for example, or the flashlight. Apps like phone calls or internet access are more questionable, given that there's a whole digital world there that relies on specific protocols for its continued function. Is this a realistic assessment? Or did he just brick his $999 jPhone?


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