Zte N850 Quick Start Manual page 36

For warranty service information, please call the following
telephone number: 1-877-817-1759 or return to the point of
sale for the products. The retailer can return the units to ZTE
authorized service center in US for repair service.
IMPORTANT: Please provide warranty information (proof of
purchase) to ZTE in order to receive warranty service at no
charge. If the warranty has expired on the device, charges
may apply.
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