Apple has recently filed two patent applications in China for dual-SIM card technologies, enabling one phone to support two cards at the same time. Such patents aim to attract Chinese customers away from competitors which have already similar features. Indeed dual-SIM card features are very popular and appreciated among businessmen in China and SEA.

[http://www.chinadaily.com.cn/business/tech/2016-10/11/content_27018748.htm]