So, for 18 months at 99p a month you get 300 minutes and unlimited texts. Total is £17.82 after rebate from e2save. You pay £30 a month and every couple of months they give you back £104:http://www.e2save.com/deal-info?price_id=4830173
With quidco offering £46 for a completed pay monthly mobile phone contract :http://www.quidco.com/e2save/
after 18 months, you'll be up £28.18. So basically, they'll pay you £28.18 over 18 months and give you 300 mins and unlimited texts.