Yes, if you can get to a wifi hotspot.
If you can connect your Nexus 7 to a wifi hotspot, then the data would be free.
The more commonly-purchased wifi version of the Nexus 7 has you connect to any wifi location.
A long press of an image will give you the options box. Pick "Save image" and it will save into the Nexus 7's Gallery.
If you have a wi-fi version of the Nexus 7 (1st or 2nd generation), which is the more common version of the tablet, you would just need to connect to a wi-fi hotspot, or connect to an internet service. If the Nexus 7 isn't finding a location for you, you can go to Settings>Wi-fi and locate the service you want to connect to.
The Nexus 7, particularly the 2012 and 2013 models, does not have a SIM card slot for cellular connectivity in the Wi-Fi-only version. However, the LTE version of the Nexus 7 does support a SIM card for mobile internet access. If you have the LTE model, you can insert a SIM card to connect to mobile data; otherwise, you would need to rely on Wi-Fi for internet access.
There are various types of Nexus devices, but the Nexus 7 is part of that same family.
If you buy an LTE version yes. If you buy wifi only then no.
The 2012 Nexus 7 came out on July 2012. The 2013 Nexus 7 came out on July 2013.
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Nexus 7 is a new Google's tablet. It's said that it's the best $200 tablet you can get on the market. It has cameras, you can connect to the internet, it supports movies and pictures, and of course, music.
It is possible to make calls on a Nexus 7 using a VoIP (voice over internet protocol) app. Google Voice, Tango, TextPlus, Skype, Talkatone, Groove IP are examples.
Before I answer, a dongle is usually defined as a device (adapter) that you would plug into a computer and will either connect you to the internet wirelessly or it acts as a was to protect software from being pirated. I will assume that the question has to do with the former (adapter to connect you to the internet). To allow for that type of dongle to work, you would need to root the Nexus 7 to do so. With the introduction of the Chromecast dongle, you can use the Nexus 7 to cast media from the tablet to a HDTV.