Arrival success ratio
An arrival success ratio of 97% is considered normal behaviour. In case you have doubts on whether the amount of text messages exceeds this number, then you can use the following rule of thumb:
There are less then 5 different phone number in the last 24 hours (this equals to roughly 5% for an average of 100 trucks per day)
There are less then 15 different phone numbers in the last 5 working days (this equals to roughly 3% for an average of 100 trucks per day)
This is considered normal behaviour.
If you see more then this, then please contact support for a more in depth investigation.