After a deep research at Nokia Forums I found that many developers have had the same issue that me, some Nokia’s phone rejects AT commands for CPMS and CMGR.
This is the output of ReadMessage.java, using the smslib.
Note (1) that CPMS detection fails, so it’s selected the MT (Mobile Terminated) storage system, but this file system doesn’t store SMS.
Figure 2 shows the modem configuration.
What it love to me is the call number detection, the event is successfully launched.
After all, I’ve reported to SMSLib Wiki that Nokia 6300 it’s not compatible with.
Although AT is available for all mobile phone, for others mobiles manufactures see your mobile manual or website.