SIM PIN2 to unlock mobile broadband device

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 ]

I had the same problem on my Lenovo. It was working OK and then for no reason it would not connect to internet and told me I needed to enter the SIM PIN2.

After some time I discovered there were fixed IP addresses and subnet codes in the IP4 and IP6 settings.

Network Connections >> right click on the Mobile adaptor >> Properties >> double click on the Internet Protocol Version 4 (TCP/IPv4) >> set to Obtain an IP address automatically.

Leave the DNS server addresses as they are if they are in there.

Do the same for (TCP/IPv6)

thank you so much man I think it should be the solution for almost everyone

now i found out why this happened to me. recently I installed a WiFi hotspot software and that changed the ip addresses and be aware that there is a lot of softwares that can cause network problems

same problem dell with dell latitude

I have two solution either update your windows 10 or try to restore os from recovery disk.

Though at&t is your internet provider but here error is related to software operating system so either Lenora or Microsoft can provide solution. To sim unlock pin for at&t here is the way mobile-cellphones.blogspot.com/2017/09/how-to-network-unlock-att-mobile.html.

The solution is to install the newest firmware and drivers from Sierra for your broadband network-card.

Many pc's use a windows driver for this card, and that is not working.

Worked for my "stone-old" Fujitsu pc.

SOLUCION PROBADA PARA LENOVO SERIE T

Efectivamente, es un tema de actualizaciones.

Referencia:

Al actualizar Win10 (Dic-2019) salta el error y no conecta de ningún modo pidiendo siempre PIN 2 SIM

No se rompa la cabeza buscando ese PIN 2 SIM esa no es la solución.

Solución (Todas juntas)

Actualizar Win10 a la última versión

Instalar Lenovo Vantage para actualizar su propio sistema.

Es posible que Lenovo Vantage encuentre una actualización para su tarjeta WWAN

Si aún no funciona actualice el firmware de su tarjeta WWAN desde la página del fabricante.

Importante

Mantenga siempre habilitado el hardaware de la tarjeta WWAN con el SIM insertado

Reinicie el sistema en cada paso y espere a que reconozca el adaptador y el SIM.

Esto puede demorar varios minutos, no pierda la paciencia.

Continúe con cada paso solo en caso le salga el mensaje de inserte PIN SIM 2

Si al final no se resolvió el problema, desinstale todo el hardware, reinicie e instale todo el proceso nuevamente desde cero

Cuando funcione le llegarán automáticamente mensajes de su operador móvil y se mostrará como la imagen adjunta.