Flip Phone for free (after £10 cashback at Quidco). T-Mobile website is giving 20% off all PAYG phones today and £10 cashback at quidco.
Technically speaking, you'll end up with £2.01 paid to you to have this phone as the quidco cashback at £10 is more than the cost of this phone at £7.99!
You need £10 top up but you get 100 free minutes next month and you still get to keep your £10 top up credit to use until used up.
Long battery life
Two preloaded games
I can't see a basic decent flip phone cheaper than this and as it is a Samsung, it's had pretty good reviews.