Tried this twice on stock rooted 4.4.2. Lost mobile data completely both times, but was able to receive/make calls over WiFi. When I say I lost mobile, I mean the option was wiped completely from my nexus like it was a WiFi only device. BTS file would not correct either. Glad I made a backup. Will be watching for further updates.
Sent from my Nexus 7 using XDA Free mobile app