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Myriam Joire (tnkgrl) was born wearing combat boots and holding a keyboard; moments later she picked up a soldering iron. She's been stomping, typing and hacking ever since. In her regular series, she'll share her tips, tricks, and mods on everything from phones to netbooks -- and be sure to catch her weekly on the Engadget Mobile podcast.

Things used to be simple: you either had a CDMA device with no SIM, or a GSM device with a SIM. If your GSM device was unlocked you could swap SIMs between carriers, and if was locked, you could swap SIMs between accounts on the same carrier. Basically, an unlocked phone meant mobile freedom. At first, the only complication was the different frequencies used for GSM in different parts of the world, which was remedied with quadband radios. Then 3G was introduced, with different frequencies used by different carriers in the same geographic area, like North America. Today, this proliferation of bands makes it difficult to build universal radios, and makes it less appealing to switch carriers. In fact, the only phone that currently supports all 3G frequencies used in North America is the upcoming pentaband Nokia N8.

The second obstacle was the introduction of special data plans, either requiring additional service layers (such as BlackBerry or Sidekick plans) or restricting the types of devices permitted as the iPhone and iPad plans do. What used to be as simple as changing APNs is now a Kafkaesque nightmare, complete with nasty "you are using the wrong data plan and we are going to send you a bill" text messages from carriers. Strike three was the micro SIM (also known as the 3FF SIM), popularized by Apple's iPad and the iPhone 4. This smaller form-factor SIM is electrically compatible with the standard SIM we all know and love -- and as such, it's easy to convert a standard SIM into a micro SIM and vice-versa (but still, it's one more hurdle standing in the way of happiness).

Let's dive in and take a look at how it's done.

Continue reading How-to: resize your SIM, change your APN, and drink the sweet nectar of mobile freedom

How-to: resize your SIM, change your APN, and drink the sweet nectar of mobile freedom originally appeared on Engadget on Fri, 09 Jul 2010 12:20:00 EDT. Please see our terms for use of feeds.

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