MC7455 AT&T Sim works, Verizon Sim does not

IoT Modules MC/EM Series
1

Hello,

hopefully someone can point me to any information.
On an embedded linux device we are using the 7455 module. When inserting an AT&T sim we are able to connent to the network without a problem.

When inserting the Verizon sim, in the same device, the sim is not detected.
being.
We tried also the Carrier Specific firmware versions of the module. But no luck.

I have the impression something basic is wrong, any suggestion very welcome.

Thanks

2

Hi,

Is this a Verizon 4G SIM or an old CDMA RUIM device? If it is saying no SIM inserted after the at+cpin? command then electrically it is not detecting the SIM and it is never going to work.

Regards

Matt

3

Hello we figured it out,

it was a problem not with the module but with ofono and the enumeration of applications on the SIM card. Will provide the fix upstream ofono.

Thanks

4

Hi, we have a problem with the Verizon SIM card with our 7455 module too? at+cpin? will return ‘SIM not inserted’. Any idea why?
On the Sierra Wireless eval board, the at+cpin works ok, but we are not able to get it to connect to the cell network.

Thanks for all your input