I am thinking of doing this deal for me and my partner making it £60 profit.
The cheapest sim only pay monthly plan is:
£15 = 150 Anytime minutes/1000 texts
You have to have the contract for 4 months making it cost £60
So you are making £30 from Quidco.
Plus you can use the following code to get a bluetooth headset = VODABLUE1
This is not gaurenteed because it is quidco, but good if you are wanting a cheap sim only contract.