Every so often O2 reminds me that as a ‘valued’ ‘long term’ customer that I can have a free upgrade to a better tariff, occasionally I have a look, more often than not its a load of Carp.
What I currently get from O2:
Yes I know I am slipping with my data use; but to be fair its only been two days since my bill rolled over 
Expect a few gig by the end of the month.
The Best Offers:
I wonder if they are in breach of the trades description act by using the word ‘upgrade’
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Maybe they think you want to send tens of thousands of text messages?
Also limiting data use can be a good thing as that makes them more inclined towards allowing tethering, which I use a lot.