Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

HWIC-3G-GSM Reports "SIM read failure"

Hi All,

I have an 1841 running 12.4(15)T1 in which we just installed a new HWIC-3G-GSM. When the router boots the HWIC reports "SIM read failure". I've tested it with three known good SIMs from two different supported providers (Cingular and Wataniya). I'm running firmware v1.1.8.3 which supports both of our tested service providers (

I'm fairly new to the Cisco world (just passed my CCNA last week) but I reviewed all the documentation I could find on the Cisco site and I can't find a cause for this issue.

Is the card defective or could this be user error?

Attached is output from the router for the HWIC-3G-GSM. NOTE the SIM chip was installed when this output was taken and yes it is a working SIM. I'm using that very same SIM in a different vendor's data card to post this message to the forum.



Hall of Fame Super Gold

Re: HWIC-3G-GSM Reports "SIM read failure"


you may want to contact the tac on this, as it's a recent hardware, if they know of any software issue or take the hwic for replacement.

New Member

Re: HWIC-3G-GSM Reports "SIM read failure"

In case you are still seeking the answer! You will need to unlock the SIM like you do when powering a cell phone on. This can be done through the modem interface (telnet to the line) and using the command

! disable PIN challenge

at+clck="SC",0,"1234" (note the quotes, and 1234 is the dummy PIN in this case)


Although I think this can now be done in IOS, but I haven't a router on which to check.

regards, Ross

New Member

Re: HWIC-3G-GSM Reports "SIM read failure"

I was clearly wrong, as I didn't read the whole post. Sorry!