This service notifies the Orange caller by SMS when the person they have been trying to call while they were unreachable - "out of coverage and/or phone turned/switched off", becomes available.
Benefits
No more unnecessary calls when the person you want to talk to is unreachable. Orange callers can just wait for the SMS to be notified when the person becomes available.
Cost
This service is FREE
How do I activate or deactivate it
Note : You need to missed call alert turned for notification of reachability to function properly.