ROM that will allow me to tether (without plan)

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http://androidforums.com РHi all - It has been ages since I have come to this site and it is good to see that some of the usual very helpful people still visit the HTC Desire section. I have just recently become a proud owner of Nexus 7. I would like to use it outside of my house and show it off to my friends but there is a slight problem. Nexus 7 only uses wifi. I could get a tethering deal on my phone but this costs about £5 more per month on Orange which I can not afford. Since I have an old "unlimited" data contract, is it possible to make my Desire tether without having to take up contract? May be (General)