N7 32GB model is an updated version of one of its newest tablets and officially gets 3G connectivity. If you can not get 3G to turn on, try following the below step by step:
How to turn on 3G on Nexus 7 32GB in 3G-enabled area
* Tap Settings from the Home screen, and select "Wireless & networks".
* Scroll down to touch More and choose Mobile Networks.
* Select Network Mode > GSM/WCDMA from a dialogue list. Then you could enjoy the high speed internet services on the tablet.