As of May 2019 the Hologram Dash has been depreciated and Hologram is no longer supporting it. 

Our Hologram SIMs and Dash hardware are made for connection to our cellular network with zero configuration. While using another SIM is technically possible, you’d have to recompile system firmware to reset the APN. Also, you’d lose functionality such as our secure inbound communication feature, SpaceBridge, and OTA firmware updating. If you still want to use your own SIM you can visit our GitHub page to get the firmware. 

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