The Secret To Making Your Own Micro SIM Card

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make your own micro sim cardWith the arrival of the iPad, micro SIMs have become commonplace for anyone wishing to connect to the mobile web from a tablet device. More and more mobile phone handsets are also using these chips which are around half the size of a standard SIM.

However, there are a few drawbacks. To begin with, swapping a micro SIM between a tablet and a standard mobile phone isn’t practical. Additionally with more and more phones requiring micro SIMs (such as the new Nokia Lumia 800) it becomes difficult to swap one of these tiny SIM cards between a new and an old mobile phone, something that might be necessary if you want to copy contacts from one device to another, for instance.

Taking a new phone or tablet abroad meanwhile, might require picking up a new SIM card on a short-term contract with a local network. But if they only sell standard SIMs, what can you do?

Fortunately there are a couple of methods that you can use to trim down a standard SIM card to micro SIM dimensions without causing damage to the important components.

Anatomy Of A SIM Card

Your SIM card is used to identify your phone on the mobile telephony network. Various data is held in the small gold chip, such as an authentication key and network specific information; numbers for sending SMS texts and details about the mobile network you use.

make your own micro sim card

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The gold section, as you can see, contains the vital stuff. Around this, meanwhile, is the card body, which is made from plastic and is only there to provide a shape for the device, important to avoid it being used the wrong way around, for instance.

When comparing a SIM card with a micro SIM you will see that they are both essentially the same item – the micro SIM is smaller and can sit comfortably within the dimensions of the larger card, but the actual chip itself is the same. This makes it easy to create your own micro SIM.

The Quick & Easy Way

Now you don’t have to follow the steps listed here as there is a slightly quicker way of doing this. However it will cost you a small amount and require a trip to eBay. Naturally we want you to be able to do this for free, but we’ll take a quick look at this other method as it provides the background for what we’re going to demonstrate in the next section.

Several vendors on eBay sell SIM cutters – resembling small staplers – that punch the chip from the SIM card at the appropriate dimensions to be used in a micro SIM device. If you wish to regularly switch your SIM between say an iPad and a standard mobile phone, you can then use a SIM adaptor.

Cutting Your Own Micro SIM

You might find a few warnings online about doing this, but as long as you have a steady hand and a reliable blade you can cut your own micro SIM and save yourself the purchase and postage costs of a device which is really intended for bulk use (although before proceeding you may wish to play it safe and order a replacement SIM card, just in case of accidents).

make your own sim card

The process for doing this is pretty simple, although it will require a SIM adaptor, which hopefully you already have. You will also need a sharp pencil and scissors.

make your own sim card

Begin by placing your current, standard SIM under the SIM adaptor so that all of the edges line up. The chip should be visible through the gap in the adaptor, with a small amount of the card’s plastic around the edges. With a pencil, mark the inner edge of the adaptor onto the card, thereby creating the outline of a micro SIM.

make your own sim card

You should have been careful with the previous step, but the real care needs to be taken with the scissors. Follow the pencil line around your SIM, trimming it down to micro SIM proportions. Once you have done this, check the trimmed SIM in the adaptor – you’re looking for a tight-but-snug fit so that the device can operate as intended, so be careful not to over-cut.

make your own micro sim card

A few moments later you should have a micro SIM which you can use with the adaptor in a traditional phone and easily swap it into a tablet.


Obviously there are only certain situations in which you should do this; it really is a last-chance option. There is no need to head off and trim your existing SIM card down!

As long as you trace the line accurately and don’t trim any of the chip, you should end up with a hand-crafted, usable micro SIM, as demonstrated in the accompanying image.

Dare you try this method to make your own micro SIM card? Or is the “hole punch” solution safer for you?

Image Credit: Wikipedia

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