It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Whoever, after the muezzin has given the call to prayer, supplicates with this prayer: "O Allah, Lord of this perfect call and beneficial prayer, send blessings upon Muhammad and be so pleased with him that there remains not even a trace of displeasure," Allah will surely accept his supplication.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 14619
Hadith Gradingحکم دارالسلام:إسناده ضعيف من أجل ابن لهيعة، وصح الدعاء بعد الأذان بغير هذا اللفظ، انظر: 14817