Reciting the Qur'an while the Mu'adhin is saying the Adhan
Q 5: When a person comes to the Masjid (mosque) before Adhan (call to Prayer), offers the obligatory Salah (Prayer), sits to recite the Qur'an and the Mu'adhin (caller to Prayer) announces the Adhan while he is reciting; which is better to recite subvocally while the Mu'adhin is announcing the Adhan until he ends the fourth time of Takbir (saying: "Allahu Akbar" i.e. Allah is the Greatest) of the first part of Adhan, then he stops reciting and follows the Mu'adhin (Part No. 3; Page No. 82) from the beginning except when the Mu'adhin says: "Hay `Ala Al-Salah (Come to Salah)" and "Hay `Ala Al-Falah (Come to success)." He would then follow the Mu'adhin until he completes Adhan to get the two rewards: the reward of following the Mu'adhin and that of the recitation done at the beginning of Adhan?
Or should a person repeat after the Mu'adhin and stop recitation?
It is Sunnah (action following the teachings of the Prophet) to stop recitation and repeat after the Mu'adhin word by word. The Prophet (peace be upon him) said: "When you hear the Mu'adhin, repeat what he says." (Agreed upon by Bukhari and Muslim)