فَإِذَا نُفِخَ فِى ٱلصُّورِ فَلَآ أَنسَابَ بَيْنَهُمْ يَوْمَئِذٍ وَلَا يَتَسَآءَلُونَ ١٠١
So when the Horn is blown, no relationship will there be among them that Day, nor will they ask about one another.
Your location stays on this device and is only sent, rounded to about 1 km, to fetch the times.