You what the mu-adhin (caller to prayer) says, except when he says: حَـيَّ عَلـى الصَّلاة (أَو) حَـيَّ عَلـى الْفَـلاح meaning “come to prayer, come to success’ instead, one should say: لا حَـوْلَ وَلا قُـوَّةَ إِلاّ بِالله
Immediately following the declaration of faith called by the mu-aththin, one says: وَأَنا أَشْـهَدُ أَنْ لا إِلـهَ إِلاّ اللهُ وَحْـدَهُ لا شَـريكَ لَـه ، وَأَنَّ محَمّـداً عَبْـدُهُ وَرَسـولُه ، رَضيـتُ بِاللهِ رَبَّاً ، وَبِمُحَمَّـدٍ رَسـولاً وَبِالإِسْلامِ دينَـاً
And I too bear witness that none has the right to be worshipped except Allah, alone, without partner, and that Muhammad is His salve and Messenger. I am pleased with Allah as a Lord, and Muhammad as a Messenger and Islam as a religion.
One should then send prayers on the Prophet (the Peace and Blessings of Allah be upon him) after answering the call of the mu-adhin.
Peace and Blessings be upon our beloved Prophet
اللّهُـمَّ رَبَّ هَذِهِ الدّعْـوَةِ التّـامَّة وَالصّلاةِ القَـائِمَة آتِ محَـمَّداً الوَسيـلةَ وَالْفَضـيلَة وَابْعَـثْه مَقـامـاً مَحـموداً الَّذي وَعَـدْتَه إِنَّـكَ لا تُـخْلِفُ الميـعاد
O Allah, Owner of this perfect call and Owner of this prayer to be performed, bestow upon Muhammad al-waseelah and al-fadeelah and send him upon a praised platform which You have promised him. Verily, You never fail in Your promise.’ al-waseelah: A station in paradise. al-fadeelah: A rank above the rest of creation. praised platform: One in which all of creation will praise him on, in order to bring about the account quickly and be relieved from the lengthy standing or the role of intercession.
One should also supplicate for himself during the time between the athan and the iqamah as supplication at such time is not rejected.
Make dua to Allah