> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hologram.io/llms.txt
> Use this file to discover all available pages before exploring further.

# All about Hologram SIMs

## Hologram SIM hardware

<Card title="SIM formats and specifications" icon="sim-card" href="/guides/sims/hologram-sim-formats" horizontal />

<Card title="SIM datasheets and specifications" href="/guides/sims/hologram-iot-sim-datasheets" horizontal />

<Card title="How does Hologram use eUICC?" href="/guides/sims/how-does-hologram-use-euicc" horizontal />

## Outage Protection

<Card title="What is a Hyper SIM with Outage Protection?" icon="shield-keyhole" href="/guides/sims/what-is-a-hyper-sim-with-outage-protection" horizontal>
  Learn how to make downtime a thing of the past with Outage Protection
</Card>

<Card title="Outage Protection details" href="/guides/sims/outage-protection" horizontal />

<Card title="What are fallback events?" href="/guides/sims/fallback-events" horizontal />

## Test Mode

<Card title="Test Mode" icon="circle-half-stroke" iconType="solid" href="/guides/sims/test-mode" horizontal>
  Learn more about getting free data for testing and manufacturing with Test Mode
</Card>

## Coverage and network availability

<Card title="Country and network coverage" href="/guides/get-started/country-and-network-coverage" horizontal />

<Card title="Cat-M1 (LTE-M) and NB-IoT coverage" href="/guides/get-started/catm1-and-nbiot-coverage" horizontal />

<Card title="Network selection" href="/guides/get-started/network-selection" horizontal />

## Performance

<Card title="What are typical data transmission speeds?" href="/guides/sims/what-are-typical-data-transmission-speeds" horizontal />

<Card title="Profile performance in the U.S." href="/guides/sims/profile-performance-in-the-us" horizontal />

## Ordering and shipping

<Card title="Hologram SIM ordering and shipping FAQs" href="/guides/sims/hologram-sim-ordering-and-shipping-faqs" horizontal />

<Card title="Return and refund policy" href="/guides/sims/return-and-refund-policy" horizontal />