AT hangs when new SIM (different provider)

I use the passthrough software to directly acces the ublox SARA R410.

When I add a T-Mobile Sim to my SODAQ SARA Rev 3 the AT hangs after a few seconds. When I remove the SIM or use the vodafone SIM the AT interface keeps working.

Any suggestions?

Hi @rschalken,

Remove the sim, put a passthrough sketch on and send the command AT+CFUN=15 to remove the saved profile.
Then you can use a different sim.

Best Regards,