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SIM cards and CSIM cards are equivalent to each other, and could both be called SIM cards casually, but they are not interchangeable.There are phones designed for use with both systems as well.Some SIM cards also store the user's phone book, as well as a list of recent calls, including deleted calls. All SIM cards are memory cards, but not all memory cards are SIM cards.If a card is transferred to a new phone, or if the data within a card is transferred to a different card, then any information stored in the card can be accessed by the new phone, and the new phone essentially becomes the old phone as far as the network is concerned. Cell phone carriers are of two types; Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA).
Users can also sign up for contracts, which often allow for more coverage and other special features.Even phones of the same type do not necessarily have interchangeable cards.Users can buy pay-as-you-go SIM cards, where the user pays for a certain number of minutes, texts, data, and even mobile broadband Internet.To get around this limitation, it is necessary to either buy an unlocked phone or to ask the carrier to unlock the phone, which many carriers do for customers in good standing.An additional hurdle is that not all SIM cards are the same size.
Mini and micro SIM cards are sold within credit-card sized squares of plastic and the user pops the SIM card out by breaking the plastic along perforated lines.