SIM PIN2 to unlock mobile broadband device

Reinstalling the driver had no effect. The problem persisted. The only solution seemed to be to completely reinstall the operating system. As that was strange, because the driver was the same, I decided to look at what files could be related to the driver in the "Users" directory. Finally I found one that could not be deleted: in "\ Users \ All Users \ Sierra Wireless \ Call Hystory \ CallHistoryLogData.txt". Accessing from outside the system, by console, I deleted it. I restarted and no more problems. Either this or reinstall all the OS. The problem is reproduced every time I restore the OS. And on each occasion it has worked to delete the file "CallHistoryLogData.txt". Two full days cost me the problem.

My computer is a Toshiba Portege Z20t-C.

Read the rest of this thread.  I had the same problem and had to update the WWAN firmware from Qualcomm.  It's been working ever since.

My new Laptop is a Lenovo T470s (S/N PC0PXLX1) with a "Sierra Wireless EM7455 Qualcomm Snapdragon X7 LTE-A" WWAN card. 

After working well for 6 weeks, I am now unable to get an internet connection using that adapter.

Windows 10 network diagnostics tells me I need to "Enter a SIM PIN2 to unlock the mobile broadband device". I can find no way to enter anything.

Tech support at both AT&T and Lenovo have never heard of SIM PIN2 and each blames the other for the problem. I have talked to each several times and have been referred to "advanced tech support." 

My internet provider is AT&T.

This community has referred to a "provider specific software" that solved one participant's similar problem.

My provider, AT&T, has given me two PUK numbers. I suspect their PUK2 may be the SIM PIN2, but I still have no way to utilize that information.

HELP!

[Moved from: Windows Insider Program / Windows Insider Preview / Install, upgrade, and activate / PC ]

what worked for me when I got the same message "Enter a SIM PIN2 to unlock the mobile broadband device" on the WIN10 diagnosis on my Lenovo X1,  I had to create the internet APN for my carrier Verizon (vzwinternet) and it worked.  I was just about to reset the network connections to clear all APN settings. But I found directions on how to create one instead. Once I chose it, the SIM connected immediately.

I had the same problem. I downloaded the latest firmware and drivers from sierra wesite and installed firmware first, and then drivers. At the end of driver installation, do not restart. A network configure program runs after driver installation. After doing this I could use sim and connect to internet immediately.

Network reset fixed the problem for me. 

My problem (with the same troubleshooting message) began after I used a 3G USB dongle. Thereafter an Ethernet network showed which said "No Interner", but was not available to edit as a network adapter. Internet connection on WiFi networks would work, but not through the Cellular network. This problem was fixed by going to: Network&Internet > Network Rest> Rest now> Restart computer.