It is recommended for the person who is praying alone to say the Adhan and Iqamah because of the general meaning of the reported Hadiths about them. Skipping them is considered disliked, but it does not invalidate the prayer.

Fajr has two Adhans: -The first is called before dawn to prepare those awake or sleeping for Fajr. -The second is called at the actual time of Fajr to announce the prayer's start.