Vivi S1 is a very good mpbile phone. It is the best phone that a customer demands for. I am personally using this phone and it has satisfied me completely. I m sooo happy to use this mobile phone. Camera quality is excellent and battery backup is also very good. Once charged , it can be operated for whole day. Processor and storage space is serving the expectations of an user. It is an ideal phone that anyone wants or desores for. I personally recommend to buy this phone as it is reasonable and serving all puposes.