While RUIM is the equivalent in CDMA-land to the SIM for GSM phones, the Neo would need a CDMA radio section to use it. It is not enough to slide an RUIM card in to a GSM phone.
While it might be possible to design a CDMA-based Neo, it would, I'm sure, be a case of one or the other. You wouldn't be able to swap the SIM with an RUIM and have it work on the other network. Furthermore, I've never actually seen a CDMA phone that uses RUIM. BREW apparently supports it, but I don't know what phones use them. - John Adam Burch wrote: What I was wondering was could the Neo be designed for later releases to use a R-UIM card that is CDMA compatible as well as a GSM SIM card? There are already phones that are usable on CDMA and GSM networks sold in the US that do not use R-UIM cards and from what I've read the R-UIM and SIM cards use the same slot.
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