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What do the status codes mean?

HLR Status Code Temporary or Permanent Description
OK Both This is a valid number and is active.
Absent Subscriber SM Temporary The recipient’s mobile number is currently turned off.
Call Barred Temporary The end user’s mobile is currently not accepting SMSs
Facility not supported Both GSM device such as a 3G dongle that doesn’t support SMSs
SMS service isn’t provisioned in the VPLMN, which means that they’re roaming.
Teleservice not provisioned Both The number, or sim, doesn’t currently have a network attached to it.
Subscribers equipment doesn’t allow receiving of SMS, e.g. dongles
Unknown Subscriber Both This number has not been used or turned on in a handset for some time and the owning network has flagged it as unknown.