This phone works out at under £25 with delivery, if you exclude the call credit. There's also 2.5% cashback from Quidco. It's ready to go on the UK's cheapest PAYG phone network, with 8p per min calls and 4p texts.. Delivery is £4.75
Phone description Nokia 1209 in Grey
The Nokia 1209 is an easy to use, affordable handset which incorporates many convenient features. A unique cost tracker application helps you to manage your call credit and keep track of your spending. Keeping connected has never been so easy; one touch short keys take you straight to your messages, calendar or phonebook. The robust, durable handset even doubles up as a portable flashlight!
Also available the Nokia 2630 for £35, with £5 free airtime: http://www.asda-phones.co.uk/pay-as-you-go/nokia/2630/