Aslamualikum all. When we ready the Qur'an as a book, we do wudu. But when we read it on a mobile, is it compulsory to do wudu? During menses can we read the Qur'an on a mobile?
It is not compulsory or needed to read Qur'an on mobiles with wudu or purity of menses as scholars classify the Qur'an on mobiles (soft copies) to not be related to the rules that apply to the written Qur'an (hard copy).
They explain that the Qur'an on mobiles is just a wave pattern of electrical and magnetic energy vibrating through space and therefore the picture of specific verses appear and goes away once you click on the screen; it is not the same as Mus'haf that a Sahih Hadith has intended it in its narration:
It has been narrated from ‘Amr ibn Hazm stating that the Prophet (Peace Be Upon Him) wrote to the people of Yemen:
No one should touch the Qur’aan except one who is taahir (pure).
Mus'haf is an Arabic word for a codex or collection of sheets, but also refers to a written copy of the Quran.
According to the definition of Mus'haf, you can notice clearly that it doesn't fit the properties of the Qur'an on mobiles and thus it can't be considered to be a Mus'haf.