SIM cards were long forgotten until a few years ago when Apple introduced the micro-SIM in its iPhone 4.
Hardly measuring the size of a fingernail, the micro-SIM was created to accommodate the shrinking width of smartphones and tablets.
Since then, more phone and tablet manufacturers, like Samsung, have adopted this format. The only problem is, however, that not all carriers (like T-Mobile) offer micro-SIM cards. So, what are the options for someone who wants to use an unlocked, micro-SIM-compatible phone, without a carrier that supports it?
A DIY, of course.
Here's the good news: there's really no difference between a regular SIM and a micro-SIM. They both use the same, exact chip, but the micro-SIM simply has less plastic encasing it.
Naturally, it didn't take long for the Internet to figure out that a regular SIM could be trimmed down to the size of a micro-SIM at little cost.
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SOURCE-CNET
