Hi
I am currently working on Hl 6528. My question is whether the GSM modem can be used without a GSM sim card . If yes than how?
Sincerely
“used” to do what, exactly 
Obviously, it can’t do anything that requires network access - other than make an Emergency call.
Hi
Thank you very much for the reply. I want to test the "test command e.g +WMTXPOWER ".
Sincerely