On March 30 a friend of mine messaged me. He wrote me that his phone and his wife's phone were appearing to be in Beirut airport. But they were at home in Mersin, Turkey. On April 2 he wrote me that his phone was showing his location as Mersin correctly. During that period this map was showing GPS anomalies in Easternn Mediterranean Sea https://www.flightradar24.com/data/gps-jamming it looks like there is still anomalies.

I think it was due to Israel's some kind of defense measure against Iran.