Samsung sells devices in America that use the American system, developed by American wireless networks like t mobile. In most of the world the dual sim function is the normal, expected even, means of interacting with service providers. By that I mean many will have a sim for inside City areas and another for a specific region or for whatever the want. This system developed over time as the wireless service was developed, specifically the way service providers sold access to their networks. So that should be easy to understand for now, America developed a system and everyone else did too. Now, in America, you rent your phone. You may have gone through a series of actions that made you feel like you own something but, if you really think about how you pay for and use your phone, you're borrowing it. American service providers developed a huge system of selling phones for their network. They then sell you a sim card... For that network. You will pay for this over time as part of a contract, or most do. If you buy their phone, paying full value up front, and think it's yours, then you should be able to do what you want with the tool that's provided to access wireless services correct? Well, then switch services. Yes, I know you can't swap out the sim and use the phone one provider sold you on another network. Because you don't own that phone, you've rented it. And the entire system is designed for you to buy their phone, which works on their network, and then use their sim which is just redundant network exclusivity really. So Americans are meant to look at TMobile coverage and Verizon coverage and instead of telling those providers which areas of their network they want to access, by using the sim card purchased from the provider, and inserting the chip, which is a network exclusive communication key, into their phone, which is supposed to be the customers tool of use for accessing the wireless network, they are told by the network they can pay for the privilege of using the phone that works on their system to use their sim which is keyed to their system and if they want to have a reasonable price you'd need to promise to pay them for a period of time to reduce risk. If you realize they exaggerated about coverage, well, the phone is not going to work anywhere else, you'll want to return it. You didn't want the sim card anyway, return that. Then the contract is broken so you pay a fee to cancel. You go to the next carrier you have to do it all again. That's a rental system. The reason other countries have unlocked phones with two sim cards is because they wanted to own their phones from the beginning, probably because they realized it didn't matter what someone told them if they paid someone every month for something so useless they hoped to return it if using another provider, then they never owned it to begin with. They were paying to use someone's stuff. So to sell phones Samsung sells Americans rental tools for one system and the rest of the world personal access tools with the ability to actually choose how they want to use the wireless network. And if they sold you an unlocked two sim phone, the American providers would simply refuse to authorize their use, and selling you a phone with two sim slots that would only work with one card may make people realize that there's a reason it feels like no one understands the things you have problems with. They're problems no one else would have accepted to begin with because they buy the service, but Americans are sold a service. It's actually a big difference if you can understand all that.
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