Shia Prayer Salah Times app for iPhone and iPad
Prayer Times based on Najaf.org for London. For other locations use Coords for Calc using.. which will retrieve your locations sunrise and sunset times and calculate the prayer times. There are different calculations for more northern countries such as Norway due to the longer days during summer.
Set a range where there is no sound (for example whilst at work)
Set a last call time which will give and alarm 30 minutes before qadha time