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R-UIM (Removable User Identity Module)

A Removable User Identity Module (R-UIM) is a specific type of data card. R-UIMs were invented for the express purpose of taking GSM SIM cards and extending them to a CDMA network. This made phones compatible on both GSM and CDMA networks, something that was previously not possible. R-UIMs were supplanted by later technological innovations, though they are still in limited use today.

What Small and Midsize Businesses Need to Know About R-UIM (Removable User Identity Module)

There was a time when R-UIM cards were a critical piece of mobile infrastructure. Businesses that needed access to both GSM and CDMA networks would take extensive advantage of these cards. Technology has trended away from R-UIM card usage.

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