You should buy a sim adaptor if you are someone who needs to work with different devices frequently. A sim adaptor helps you to insert your sim card into different devices effortlessly. Not all devices come with same sim card slots. There are no universal slots for sim cards globally too. In this case the sim adaptor becomes your saviour by providing you with the ease of switching between different smartphones, iPhones, tables, etc. One sim adaptor and you get network access on all your devices. You can use the same sim card on every device.