m.setContactBlocked(getSingleRecipientIdentifier(number, m.getUsername()), blocked);
} catch (NotMasterDeviceException e) {
throw new Error.Failure("This command doesn't work on linked devices.");
m.setContactBlocked(getSingleRecipientIdentifier(number, m.getUsername()), blocked);
} catch (NotMasterDeviceException e) {
throw new Error.Failure("This command doesn't work on linked devices.");