Is it worth paying £5.50 extra for the iPhone 4S rather than the iPhone 4?

I have found a deal online to buy the iPhone 4 free, on a £20.50 monthly contract, lasting 24 months, however the iPhone 4S is £26.Is it worth paying the extra £5.50 for the iPhone 4S? Bearing in mind I'm a student with a weekend job.

Extra information about the contract:
iPhone 4 £20.50 includes 100 minutes, unlimited texts and 500 MB data.
iPhone 4S £26 includes 500 minutes, unlimited texts and unlimited data.

I need unlimited texts so that can't change. Data is also useful for me.

In my opinion, yes.

The 500MB data won't go very far, and the better plan has unlimited data.

5 pounds is less than a meal at McDonalds.

Yes. IPhone 4S is a great phone. It comes with Siri as well as talk and type voice recognition software, So any texts, blogs, emails, Even this answer I just spoke into my phone, etc., all you have to do is say them. There are a ton of functional apps as well as social and entertaining ones in the App Store. I also find that my 4S picks up 4g signal MUCH better than my moms 4. Money well invested in 4S!

IPhones like jeans carry forward their limitation onto the next iPhone, and whilst iPhones appear "attractive" and almost everyone you see has one, many*** of the other mobiles are in fact better. Asking Bing Google supplemental questions invariably means abandoning Apple altogether.

The answer is No & No ( Student Professor anybody you pay high prices if you are bidding in an auction not for a logo) Reason for NO & NO.
The IP4 is months away from being discontinued on release of the IP5S.

Apple only support LAST 3 iPhones, discontinued means no longer sold by Apple, any future upgrades are for supported phones some new apps just WON'T WORK

On 12/09/2012 IP5 announced IP 3GS DROPPED, like the year before IP4S IN, IP3G OUT.
no maths IP5S IN…

It may be the cheapest when compared to other iPhones but to invest any money in an OVERPRICED device is a waste as in 2 years you will be using a 5 year old device that came out in 2010. Many have already upgraded from the IP4 in 2012
http://www.itproportal.com/2012/09/06/8gb-iphone-4s-version-be-introduced-iphone-5-launch/
http://www.gsmarena.com/...ew-490.php
http://www.gsmarena.com/...ew-665.php

There are newer phone better phone and they cost a lot less, giving you more than an iPhone

You should look at eg Sam Gal ACE II or the Lumia 620 for phone with a secondary camera microSD expansion Wi-Fi, GPS, DUAL CORE… AND BLUETOOTH MEDIA TRANSFER (Sharing) which no iPhone even the IP5 has. *** (The IP5 specs were on a another phone 18months BEFORE the IP5 launched)
Here are the specs http://www.gsmarena.com/...hone2=5147