The Hologram eUICC SIM Card is a mix between legacy and new technology when cellular service is needed your project. This eUICC SIM Card enables profile switching capabilities so you can dynamically change the subscriber profile while your chosen devices are in the field, over-the-air. For those looking for IoT cellular service with no intentions on switching cellular carriers, this SIM card is for you.
eUICC features are limited to certain modules at this point. This includes the u-blox SARA-R4 module used on our SparkFun LTE CAT M1/NB-IoT Shield - SARA-R4. For these situations, the functionality will be that of a normal SIM with cellular service through Hologram. You won't be able to change carriers.
The Hologram enhanced eUICC SIM card [ e.g. CEL-17117 ] will work with SparkFun LTE CAT M1/NB-IoT Shield - SARA-R4 [ e.g. CEL-14997 ] but the special eUICC features will not be operable with the shield at this current time.
If you need further assistance with these key features please visit the Hologram support forum:
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Have to confess, I don't understand the description of this product at all.