The lightest touchscreen mobile phone is the sWaP Nova, which weighs 40.3 g (1.42 oz) and was achieved at the Gadget Show Live in Birmingham, UK on 12 April 2011. It is manufactured by Dyal Trading Ltd. (UK).
The phone measures (L)68.5 x (W)38 x (D)16.2 mm (2.7 x 1.5 x 0.64 in).