I am used samsung s duos. This is poor phone. Because of very slow operating.low ram and low storage space.and heavy apps does not work inthis phone.if heavy apps install in this phone. than this phone was hanging.and does not operate properly.and only small apps will be good for this phone.and phone works properly.but in this phone main problem is hanging.always this phone is hanging. Than I am disapointed about this hanging. No hd support. Corner colour of this is remove after some time. All colour remove day by day. And if insert memory card 32 gb than phone is also hang.because of heavy card.this is biggest problem in samsung s duos.