In order to send a command to your tracker from your smartphone:
1. Your smartphone must have a data connection enabled and connected; and
2. Your tracker must have an active data session.
It is possible that your smartphone or tracker is displaying as having a signal, however the signal indicator on your phone shows a general signal strength. It is possible that even with a signal showing on your phone / tracker a data session is unable to be maintained with your tracker whereby a command can be sent and a confirmation received within the required timeframe. If a command fails to send and be confirmed as Successful, please ensure your smartphone has the strongest possible signal and try again.