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View Full Version : iPad forces operators to shave their SIMs



Ben
3rd February 2010, 06:07 PM
"O2, Orange and DoCoMo are all apparently stocking up on micro SIMs suitable for Apple's iPad, though taking a sharp knife to an existing SIM is always an option.

Quite why Apple decided to use the third form factor for the iPad's 3G module isn't clear, but anyone planning to stuff an existing SIM into an iPad will need to be prepared to slice off some edges to make it fit.

The Micro SIM was originally suggested by Nokia back in 1998 - Nokia wanted to make super-tiny handsets and the size of the SIM had become a limiting factor. Early GSM phones used a credit-card-sized SIM, which quickly reduced to the "Mini SIM" we know today, but that gets further cut down for the Micro SIM specification.

Apple has been saying the Micro SIM will also support a more-comprehensive phone book as well as greater security. In fact, both of these capabilities are part of the USIM application, which can be installed on a SIM of any size or shape as part of the 3G standard.

The traditional SIM address book supports only name-number pairs, but the USIM requires support for multiple phone numbers attached to a single name, as well as a field for an e-mail address and user-definable groups. But phone manufacturers, who have no interest in customers storing data on the operator's SIM, have been slow to integrate this functionality.

None of which explains why Apple would choose an unexploited standard for the iPad. There might be a small measure of operator lock in, but DoCoMo has already announced it will be selling Micro SIMs for the iPad, while Gemalto is reportedly supplying them to O2 and Orange in the UK, so the choice seems increasingly strange.

Perhaps Apple is offering operators an opportunity to differentiate between computers and phones on their networks - computers, and dongles, could use Micro SIMs (sold with broadband data-only tariffs) while phones will use existing SIMs with unlimited data, and those of us in possession of a sharp knife can enjoy the best of both worlds."

http://www.theregister.co.uk/2010/02/03/ipad_micro_sim/

Nice picture, worth a click! :p

I think the last comment about allowing operators to differentiate between different types of customer based on SIM form factor is pretty obvious, and we've already been there. Glad to see the operators will definitely be stocking these :) Makes me more inclined to believe Micro SIMs will be the way forward.

miffed
3rd February 2010, 06:33 PM
I am a little confused now ,I had seen pictures suggesting that the only difference in size between the SIM and Micro SIM was the length ! (meaning only one cut - or two if you include the corner bit ) ... But this looks to be smalle across both axis , .....hmmm , more scope for mishaps with the scapel !!

DBMandrake
3rd February 2010, 06:51 PM
The picture in that register article is not to scale and is incorrect - only 2 sides have to be cut, (plus a little off the corner) not 4 as implied by that picture...

The following is a more accurate comparison:

http://www.theiphoneblog.com/images/stories/2010/01/365px-GSM_Micro_SIM_Card_vs._GSM_Mini_Sim_Card.svg.png

A standard SIM is 25x15mm and the Micro SIM is 15x12mm, so you need to cut 3mm off the side and 10mm off the end.

DBMandrake
6th May 2010, 02:01 PM
I knew it wouldn't be long before someone put up a good SIM trimming tutorial :D

http://www.johnbenson.net/How_to_Convert_a_SIM_to_a_MicroSIM_with_a_Meat_Cle aver/How_to_Convert_a_SIM_to_a_MicroSIM_with_a_Meat_Cle aver.html

Ben
9th May 2010, 01:44 PM
Grr, seeing those pictures has made me want the 3G version ;) But no, I'll resist.

Nice cleaving!

Hands0n
9th May 2010, 09:02 PM
If you are going to trim your SIM down following those instructions please make absolutely sure that you make a note of the SIM's number for future reference. If, for any reason, you need it you will be stuffed if you don't keep a record.