The discount scheme is called O2 Open.
T&C's here
http://www.o2.co.uk/termsandconditions/rewards/o2-open-terms-and-conditionsRegister here
https://o2open.co.uk/O2Open/servlets/SignUpOnce you have your code and within 30 days of signing a new contract text OPEN followed by your open code, mobile number, name and postcode to 2020
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