Mobile by Sainsburys customers can receive £1 of free credit by testing "YES" to 40773.
Every few months, Mobile by Sainsburys have a free credit offer, usually you have to top up by £10 to get any credit, so this simple text is worth it for a free quids worth of credit.
On Mobile by Sainsburys, £1 gets you 12 minutes of calls, plus one text message, so they aren't giving away much, but it's a freebie, so why not?
