i think the purpose of the SIM interposer is to unlock the GSM side of the CDMA iPhone 4s & iPhone 5. i tried both the R-SIM8, and the GPP Sim on my iPhone 5. It does unlock it for me to use TMo or AT&T, but won't allow 3g data connection, just EDGE. It won't work for CDMA. I'm still trying to figure how to get my Sprint iphone 4s on PagePlus, but no success
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