Is an iPhone 4S still worth buying?

I'm planning on buying a new phone for the coming 2 years. I'm choosing between an LG G2 Mini and an iPhone 4S. I've got an iPod, iPad and an iMac already, so it would be practical to buy another Apple product. However, I don't want to buy an iPhone 5S or 5C since I'm a poor student. But will an iPhone 4S survive 2 years of updates and stuff?

Added (1). 8GB

Added (2). According to the site it seems that iOS7 will already be installed though

I have an iPhone 4 not 4S but their basically the same phone excluding minor things and its getting ALOT slower with each update. If your going to use it for the next few years id suggest to save up more for the 5S honestly, but thats just me.

No. Don't get an iPhone 4S. It will probably start lagging in a year or so.
You could consider getting a Galaxy Note 2 it is much better than an iPhone 4S in my opinion.

For 2 years, 4S is fine, you can always trade it in and upgrade in 2 years when the contract is up.

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