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02-19-2004, 6:50 AM gmitchell Joined on 12-01-2003 Optomation Systems, Madrid, Spain Posts 143 SIM Chip Compatibility If you are in the phone business this may be obvious, but if you in the industrial automation and IT business, maybe its not. There exists two voltage levels for SIM chips. Older chips which needed 5V and newer chips which now operate on 3V. The SIM chip readers used in products can be either, although Nokia state that since 2002 only 3V SIM chip readers in all their products. So what’s the issue? If you take a 5VSIM chip that works perfectly in your older phone and put it in a Nokia30 Terminal, it won’t work. Diagnostics indicate that the SIM chip is faulty, when you know it isn’t. "Faulty" in this case means "older", which isn’t quite the same thing! This also explains why when you upgrade your older phone, the phone shop often changes the SIM chip “for free”. They may not know why they do it, but they know it makes it work. Nokia30 terminals are not so easy. The obvious question is how do you know whether your SIM chip is 3V or 5V? The answer is you don’t...... It just works or it doesn’t.    Report

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