Why not lose yourself for a few days, and leave your mobile phone at home?
There are card-taking payphones (cards available from Info Points) scattered around the site, near to the Info Points. There used to be huge queues to use the phones, but with the proliferation of mobile phones, things are now much easier. There are also low-level phones by the Meeting Point and Top for smaller people.
Orange (one of the event sponsors) set up extra transmission capabilities to try to ensure there is enough coverage for mobile phone users on their network. They also have a tent on site where you can charge your phone (of any make/service) for the cost of a small donation to charity. You drop your phone off and pick it up a few hours later, but there can be big queues.
People using other mobile operators may find it difficult to get a line - as this is a rural area with a low population, the capacity of the transmitters may not be up to the thousands who arrive for the Festival. However, some networks do install temporary transmitters.
Souvenir (but still usable) phonecards used to be available, but it looks like they're no more.
eFestivals t-shirts, vests, hoodies, fleeces, mugs, tickets
As well as being the UK's most popular festivals website, eFestivals sells its own range of clothing and other goodies. There's a range of t-shirts and vest-tops, and hoodies and fleeces, all featuring the eFestivals 'dancing man'.
eFestivals is 
