The Z310a is Sony Ericsson’s latest entry-level offering for AT&T’s lineup. While light on features, the Z310a is stylish and offers solid build quality, which should help it stand up to a bit of abuse over time. The Z310a is a small flip phone for the entry-level crowd. Though somewhat thick at 25.4mm (1"), this stylish handset is smooth, and fits nicely in your hand.
The soft curved edges make it feel very sleek. I have the black model for this review, though the Z310a is also available in light pink and a bronze color. The phone weighs 91g (3.2oz) and is nicely weighted so that it feels solidly built, and not too light. The phone does not creak when in use, which further attests to its solid construction.
Sony Ericsson Z310 Review (MobileBurn)