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Na wikipedii pod haslem Micro-SIM mozna przeczytac cos innego:
"The micro-SIM was created with backwards compatibility in mind. The major issue with backwards compatibility was the contact area of the chip. Retaining the same contact area allows the micro-SIM to be compatible with the previous, larger SIM readers through the use of plastic cutout surrounds. The micro-SIM was also designed to run at the same speed (5 MHz) as the previous version."
Karta Micro SIM – z czym się to je? | SIMblog