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Hologram SIMs are provisioned for permanent roaming and hold credentials for 550+ networks across 190+ countries. Modem firmware scans and selects networks based on supported bands, signal conditions, and device logic. Traditionally, a modem connects to the strongest viable network. Availability varies by device bands, geography, tower traffic, and firmware. For firmware-specific behavior, consult your device manufacturer’s documentation. Hologram Hyper SIMs with Outage Protection add resiliency by providing two independent connectivity profiles spanning 330+ global networks each. During an outage, your SIM can transition cores to minimize downtime. Learn more about Outage Protection.