: The protective USB cap is often lost; these are generally found only by purchasing a "for parts" unit on eBay . Important Compatibility Note

3G devices like the AC2766 no longer work on many modern networks. ZTE Mobile Broadband USB Modems for sale - eBay

Knowing if you need the full device or a specific replacement part helps narrow the search.

: eBay is the most reliable source for legacy ZTE modems, often available as "New Old Stock" or used units starting around $10.00. Global Wholesale : AliExpress and Alibaba