Since the iPhone XS released in the fall of 2018, Apple has provided support for dual SIM cards for its own smartphones. If you feel that the dual-SIM combination of nano-SIM + eSIM is not advanced enough, the newly released iPhone 13 product line today also further provides support for dual eSIM functions. Of course, the prerequisite for all this is that the operator you need supports writing numbers in the air.
Apple's official website pointed out: "If you are a big fan of the iPhone and have a demand for dual SIM cards, then the new phone can really make things better."
It should be pointed out that you can only use two lines at the same time-either physical SIM card + eSIM, or dual eSIM.
each smart phone, every one want to buy a phone case for it, such as https://www.eluxuryonline.com/louis-vuitton-iphone-13-case
Designer Louis Vuitton iPhone 13 Cases Cover Leather Wallet Pouch
If there are special needs such as "three cards and three standbys", obviously you can only rely on customized solutions from other mobile phone manufacturers (you might as well go to the "universal China Huaqiangbei" for a stroll).