Sorry if this is a double post but it seems that anyone with a CDMA 4s that's installing sbsettings and toggling the 3G toggle losing service and cannot get it back. Some seem to have luck with resetting network settings and others not. It did happen to me to and I ended up doing a restore. I didn't know to try resetting network settings so did not try it. Hope this helps someone. If you've had an experience please post if the reset works without a restore.