Service mark symbol. The service mark symbol (â ), the letters SM in superscript style) is a symbol used in the United States to provide notice that the preceding mark is a service mark.
Size matters: The micro and mini USB connectors are of similar width. But the micro connector is much thinner (smaller vertical dimension). Some product designs were not able to accommodate the height of the mini receptacle and the new thinner receptacle will encourage and allow thinner products.
While the micro SIM is smaller than the mini SIM, its capacity for data and memory is exactly the same -- up to 128K, depending on your carrier. A SIM card always holds your phone number, when applicable, and links the device that holds it to your account with a service provider.