If you are using Teltonika's router RUT955T03XXX , you can apply the following Mobile Configuration to get the device online when using an EMnify SIM card.
1. Always use the SIM in slot 1.
Select connection method "Automatic" in "Network Frequency bands".
Enter the APN manually - em - activate data roaming and don't enter the PIN as it is not activated on EMnify SIM cards.
Under SIM Management, apply the configuration below:
In the "Network Operators" tab, you should then see the operator your device is connected to:
Make sure to set the reconnect interval to Manual.