In order to enhance customer experience and brand stretch, we have collaborated with China Unicom to strengthen our cooperation. China Unicom has signed more than 8000 cooperative branches, which have been deployed to 4-5 tier cities! If there is a quality issue with the product and the above network does not exist in your city, please call our national after-sales service hotline at ***. Our after-sales customer service will arrange for the China Unicom after-sales network network network in your city to repair it.