Sainsbury’s Mobile is currently offering a free £15 SIM bundle for, well, free! All you have to do is fill in the form on the linked page, and activate your SIM within 30 days. You should be ready to rock within 48 hours thereafter.
The generous allowance includes 800 minutes, 5,000 texts and 2GB of data. Again, entirely free!
As an added bonus, you can win one of five free Samsung Galaxy Note 4s. Just top up by £5 or more by March 31, 2015.
Sainsbury's Mobile uses the Vodafone network.
(Thanks to goonertillidie at HUKD)