Samsung Galaxy Grand Quattro is a mediocre mobile with 1GB RAM and works in Android 4.2 Jelly Bean platform. It is expensive compared to its quality. Same kind of mobile with similar features and better efficiency can be bought in lesser price. Most of the Chinese brand provide better quality mobile than this in half of its price.
I am using this grand quattro for last one and half years. Now, it has started creating problems. First, it is hanging again and again. It simply does not work properly. If you want to open an application, wait for at least 15 minutes.
And, the major problem is that, the application has been started downloading automatically. I did everything to stop it, but still continues. This is not just working. I am replacing it with some other brand.