Seen this and i have read and checked the small print so here it is:
1 month o2 sim only deal cancel with 1 month notice:
£15 for 300 Xnet minutes and 300 texts
Get £15 back via redemption and £15 from Quidco
So stay on for 2 months to get cashback from both E2SAVE and QUIDCO to make this totally FREE.
Not bad for someone for a month or if you have a relative come from abroad or something
Put it in as £15 on the deal but its actually costing you zero...