What you see in the image above is the evolution of mobile phone SIM card design over the past four years. The largest in the image, known as the mini-SIM, was used for quite a while as the standard in GSM cell phones. However, as smartphones began to rise in popularity, drop is cost, and brought increased functionality, it was determined that the mini-SIM just wasn't mini enough. It took up too much of the precious real estate that mobile phone manufacturers needed for other things. Thing like a GPS radio, Wi-Fi, larger batteries, dock connectors, graphics chips, and more. And so began the start of the shrinking SIM card.
Are you rolling with an out-of-contract AT&T iPhone? If so, there's no reason to keep it locked to the AT&T network as of this weekend. Starting on Easter Sunday, AT&T will unlock any out-of-contract iPhone at the request of the customer. This means you can swap out the SIM for that of any other GSM carrier. This makes it super-easy when traveling abroad. In order to get the unlock, your account needs to be in good standing, so make sure you're all paid up.
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