It's off-topic, but I have an opinion on this;
Fuzzy and PCgamer are both right - each to a degree.
An "Investment" is generally referred to as something you put money, time, or effort into with the expectation of a beneficial return. (mainly money, or some other kind of benefit one would consider as being 'profit')
While "investing" money in electronic devices is generally considered a joke/fool's folly (with the exception of things like, say, an old Atari - things that might/will become a collector's item), it can be looked at in another way too -
If you "invest" in electronics/technology, and it increases your ability to perform your work faster or more efficiently (meaning, more efficient/less time=more money), then THAT is an acceptable "investment" of your money.
If it's 'just a phone' or device you 'enjoy owning/playing with' - then, that's not really an investment at all.
Ask anyone that owns a boat. lol
The SGSIII is a really great phone (and in limited ways, a decent pocket-computer) - but if you don't have a serious 'financial' or work-related need for it, or it's capabilities... it's really no better than your old phone in that regard, and is merely 'nice to have' and/or play with.
Think about it.
If spending $500 helps me earn more money - then THAT'S an investment.
If it's just a cool new digital toy to have - then, well... you get my point.