Shanghai Golden stone has been selected as one of Google ODM MADA partner. The MADA partner allows Golden stone to have GMS on :

Pioneering and innovative, based on the market and development; high-quality, efficient and attentive service for the user, harmonious innovation and market development, unity and struggle, and create the future. 

Shanghai Golden stone was established in December 2007. Mainly engaged in 2G, 3G,4G and variety of mobile terminal product R&D, production and sales, product line covers GSM/TD-SCDMA/WCDMA/LTE.