Can I use my sim card from a legacy plan in this device so that I can continue with my current plan?

The product is GSM Unlocked, which typically allows you to use a SIM card from any carrier that supports GSM networks, including those from legacy plans. However, specific compatibility with your plan is not mentioned.

Questions & Answers: Inseego MiFi Jetpack 8800L | for Verizon and GSM Unlocked

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Inseego MiFi Jetpack 8800L | for Verizon and GSM Unlocked | 4G LTE Mobile Hotspot

GSM Unlocked (Original carrier is Verizon)
Featuring a full-color, 2.4 touch screen display, the MiFi 8800L boasts more features and onscreen help than ever before, giving you the best user experience possible.
Achieve ultimate download speeds with LTE Category 18 with 5x carrier aggregation. With real simultaneous dualband Wi-Fi, the MiFi 8800L allows up to 15 Wi-Fi clients to connect in 2.4GHz or 5GHz bands simultaneously, improving the link quality and speed, reducing network congestion and improving the quality of the wireless connections.
From hacker prevention, encryption, enterprise-grade protection and VPN pass-through, you can connect with confidence that your data is secure. MiFi 8800L features the latest Wi-Fi security protocols, password protection and Guest Wi-Fi network. IT administrators can now customize the settings on the Admin portal to prevent the devices factory reset button from being used.

$176^.99 –