Hi there,
If you recently bought a mangOH Red with a 100MB SIM in the kit, check in your AirVantage* account that your Provisioning options says “General: LTE” and not “LTE-Only” :
If you are in “LTE-Only” mode, you’ll need to add “SMS-MT” and “SMS-MO” provisioning options :
The operation takes a couple of minutes to execute.
*Note: you need first to create an AirVantage account (free) in order to manage your connectivity options, as described in the Getting Started tutorial (https://mangoh.io/mangoh-red-resources-getting-started)