call_block = 30; // call block for the rates(30 seconds)

if(free_call_days_left > 0) // to check if the free calls are still available or not
{
if(same_operator(number)) // to check if you're calling the same operator or not(U Mobile to U Mobile)
{
 if(time_hr >= 0 && time_hr < 19) // 12a.m to 6.59p.m
 {
  if(daily_free_talktime <= 60) // Haven't reach 60 minutes of daily free talk time, the rate is foc
  {
   call_rate = 0; // foc until 60 minutes has been used up for each day
  }
  else // reached 60 minutes of daily free talk time, so normal rates will apply
  {
   call_rate = 0.09; // 9 cent per 30 seconds
  }
 }
 else // 7p.m to 11.59a.m
 {
  call_rate = 0.03; // special promotional rate: 3 cent per 30 seconds
 }
}
else // calling different operator, so normal rates apply
{
 call_rate = 0.09;
}
}