What is the difference between uim card and sim card

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A SIM card also known as subscriber identity module or subscriber identification module SIM , is an integrated circuit running a card operating system COS that is intended to securely store the international mobile subscriber identity IMSI number and its related key, which are used to identify and authenticate …. Sending a SMS to Send your postal code to Please refine your filters to display data. Related Terms Business Technologist.

Digital Assets. Digital Finance. Fusion Team. Internet Speed Test. Remote Control. The existing phone must be unlocked and compatible with the frequency band of the new carrier for this to work, however. It's important to note that, for the RUIM card to work in a new handset, that phone must either be from the same cell phone service provider or unlocked. In some countries, like the US, a phone handset is usually locked to a particular carrier, which means that only RUIM cards from that same carrier can be used in these handsets.

An unlocked phone is one that has had this limitation removed; any card from any carrier can be used in an unlocked phone. Phones on the CDMA network that do not use RUIM cards store all of the user's information in the phone itself; if the user wants to change phones, he or she has to go to the cell phone service provider, who will transfer the information to the new handset.

GSM network phones use SIM cards, which store all of the user's information, so activating a new phone is often as simple as moving the card from one handset to another.