as above
you get all this for £10 topup a month
you have to go through this link to get the extra £5
http://giffgaff.com/orders/affiliate/jpwilky
copy and paste this link
plus you get free calls and txts to other giffgaff users for 3months as long as you topup once every three months
you have to have an unlocked or 02 mobile as giffgaff works on the 02 network