For users having no service after using sbsettings on your 5.x CDMA device, it is not caused by sbsettings but instead by the 3g toggle.

To fix it:
1) Disable the 3g toggle in the more app (don’t use it)
2) go to settings, general, reset, and reset your network settings.
3) Reboot.

I am pushing a new sbsettings with a 3g toggle that should detect and not run on CDMA. I don’t have a 4s on CDMA so I can only test my iphone 4 Verizon which it seems to work ok there.