For some reason none of our WR21 manages to send SMS's. My first gues was a issue with our provider but putting the sim in a regular smartphone allowed it to send SMS.
The WR21 can receive SMS (seen in event log) but can't reply. Any way of knowing more about the issue then 'SMS failed to send'? (which is shown in the eventlog).
Trying to send an sms with the sendsms command doesn't work either.