Assuming you have attached an image for your Gmail account, and you are using the stock messenger, your picture should appear.
Since the question doesn't specify what Nexus the person is comparing it to the Nexus S, here's the order of Nexus phones (and by manufacturer) to date: -HTC Nexus One -Samsung Nexus S -Samsung Galaxy Nexus -LG Nexus 4 -LG Nexus 5
Samsung Galaxy S
It was manufactured by Samsung.
Yes it is possible to unlock the Samsung Nexus s4 g if you contact the carrier you were with before you switched you can ask if they can unlock the Samsung Nexus s 4g for the new carrier to add you
There are only a few differences between a Nexus S and a Nexus S 4G. Nexus S is T-Mobile phone, while the Nexus S 4G is a product of Sprint's Samsung. The only other major difference is that the 4G version offers Google Voice.
The Samsung Nexus S was an evolution of the original HTC Nexus One's design and hardware. The Samsung Galaxy Nexus was a leap forward from that design, going with a significantly larger display, better chipset and CPU/GPU, a much improved design, and was arguably the first widely commercially-available and advertised Nexus device.
The Samsung Nexus S 4G is a an excellent phone. I recommend you try it or but it if you've never owned one. Also check online for great contract deals.
According to CNET reviews, the Samsung Nexus S does have a good video component, display screen, clarity for recording, and video playback. The service provider is AT&T.
It is one and the same device. The GT-i9020 is the Super AMOLED version of the Nexus S. The GT-i9023 is the Super Clear LCD version, and was for the European market.
You can find the Nexus static wallpapers if you do an image search. If you're looking for the Nexus live wallpapers, you can find those in the Google Play store.
You should get whichever phone has the items on it that you need. This might be the HTC one or the Samsung Galaxy Nexus. Whatever it is, you can choose based on your overall desires and needs.
That really depends on what you want and value in a smartphone, since it is very subjective. However, the Samsung Nexus S is slower than an iPhone 4S but a bigger resolution, but in general, the iPhone 4S seems better.