AT Commands for SARA R412M and T-Mobile

SARA AFF
1

I’m trying to connect my SARA R412M to the T-Mobile network. I’ve tried the steps from http://support.sodaq.com/sodaq-one/sodaq-sara-r410m/#tmobile_at_commands but I’m stuck at AT+CGPADDR

The value returned is always: +CGPADDR: 1,0.0.0.0
So I’ve also tried combining with other commands from: http://support.sodaq.com/sodaq-one/at/

When I enter AT+CGATT? the result always is: +CGATT: 0
When I’m again try to connect with T-Mobile with AT+COPS=1,2,"20416" the result is: +CME ERROR: SIM failure

I’m wondering if I’m using the right commando’s because my device is a SARA R412M and not the R410M.

AT+CSQ is returning values between 14.* and 19.9

2

I’ve successfully used an R412 with a KPN SIM roaming here in the UK. I’ve never tried T-Mobile, but at the risk of stating the obvious it sounds like you have a problem with your SIM card?

3

Ok, but is scrambling also neccesary in the UK? I found out that it’s needed for the networks in NL https://forum.u-blox.com/index.php/19104/r410m-support-configuring-customizable-aspects-sara-modules.

There are options to activate them but that won’t work in the R412M yet. Done with the commands described in this post: