# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2010-02-13 13:22:03 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/9055025846) In reply to: [@andiih](http://twitter.com/andiih/status/9054823874) @andiih Giff Gaff. They are sort of an experimental MVNO (Mobile Virtual Network Operator) running on O2's network. Free SIM, with £10 topup