Listening to the Azaan with one’s hair uncovered
Q: Can a woman listen to the Adhan or read the Quran without covering her head?
A: Yes, though the adab is that she should cover her head at all times.
And Allah Ta’ala (الله تعالى) knows best.
وَمَن يُعَظِّمْ شَعَائِرَ اللَّـهِ فَإِنَّهَا مِن تَقْوَى الْقُلُوبِ ﴿الحج: ٣٢﴾