Can the Nexus 7 send and receive GSM texts and calls? The Nexus 7 3G is out and I'm wondering whether Android 4.2 tablets are still data-only devices.  Can I install a custom ROM or apk to this tablet so that I can send and receive GSM calls and text messages on it?  If not, why not?  What's missing?

Added: Nexus 7 3G has many hardware features of phones, but not all: It has gps, bluetooth, headphone jack, accelerometer, gyroscope, ambient light sensor, compass and nfc, but does not have a receiver (earpiece), haptic feedback (vibrate) or a rear camera. IF the 8"x5" tablet can be used as a phone, you won't look funny putting it against your ear because it has no earpiece.

Added: The question is about GSM calls and texting, not VOIP or SIP calls or tethering.
Yes and no. The hardware is capable of sending/receiving GSM calls and texts but there's no way to do with via the stock software. I doubt any after market app would do the trick either, as it appears that tweaks need to be made at the OS level.

There are a couple of devs working on this on XDA. There's no eta, but they should get it done in time. We can only wait.

http://forum.xda-developers.com/showthread.php?t=2025377