When you land in the country with your second SIM, switch to it to join your local data plan there and you won’t get massive roaming charges from your carrier back home. And if you want, you can keep the second SIM active, too, so any calls that go to your US number will still be able to be received in Japan.ĭual-SIMs can save you a lot in data charges too. This means that when you land in either country, you can quickly just switch to the local mobile carrier you use there. A dual-SIM phone means you could keep a SIM for your mobile plan in, for example, America, and also keep a SIM for your mobile plan in, for example, Japan. That second group of people that really benefit from dual-SIM phones are international travelers or people who spend a lot of time in two or more countries. The personal number you give to your friends and family, and the business number you give to your clients and coworkers. A dual-SIM phone allows them to have one phone number for personal use and one phone number for business use–all linked to the same phone. However, two phone numbers linked to one phone, and thus dual-SIM phones, are incredibly useful to two specific types of people. And the truthful answer is: most people don’t want–or need–two different phone numbers. Why would I want two different phone numbers? That’s the question many people ask when they inquire about what a dual-SIM is. This gives your single phone two different phone numbers. By inserting that chip into your smartphone, that’s how mobile providers know which device to route calls and texts to when they call your number.Ī dual-SIM phone, then, is simply a phone that has two slots, in which two different SIM cards can be inserted at the same time.

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