The ruling on the adhan for one who prays alone in the open

Question:
Honorable Shaykh, peace and blessings be upon you, and may you be granted much clarity.

Answer:
Yes, yes, he should call the adhan even if he prays alone. Especially if he is in the open, for it is reported in the hadith that the one who is in the open from the mountain calls the adhan and prays. He calls the adhan even if he is alone, and he raises his voice with the adhan; it is obligatory that those around him, from the jinn and humans and the mountains, hear it, and they will testify for him on the Day of Resurrection. Yes. Good. Because the adhan is a remembrance of Allah (Glorified and Exalted is He), a symbol of Islam. It contains the exaltation of Allah (Mighty and Majestic), it contains the call to Islam, the call to prayer, and it contains the proclamation of tawhid (the oneness of Allah), so it is a great remembrance.