o2 contract am i confused?

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Currently on an o2 contract which isnt brilliant however it is what it is;

600 mins
500 o2-o2 mins
unlit txt
£26 per month
+ £6 data add on

£32 total cost however £6 is an extra/bolt on

On their website they have a deal for;

unlimited mins
unlimited txt
1gb net
£31 per month

Now yes it works out cheaper for more, however the monthly tarrif is actually higher so looking at the T&c should i be allowed to move to it?

When you sign up for, or upgrade to, a new minimum term contract you will not be able to move to a lower priced tariff (with a lower rate monthly subscription than the tariff you've joined on) during your minimum term. If you move to a higher priced tariff, unless we tell you otherwise, the new tariff will start at the start of your next billing cycle. When you move tariff, you may have to accept the Tariff Terms for that tariff at the time you move and they may be different to these ones. Make sure you check our website for the current terms before you change your tariff. If you move tariff you may not be able to change back to your previous tariff