I am looking to buy a new smartphone to gift my mother as her birthday will be in next month. I don't wan't any smartphone from micromax, lava, or celkon as these mobile are of no use and start giving problem after 6 months. Atleast a branded phone like samsung or sony which looks good and it is also good for making impression on to other.

My basic requirement are:

1. Phone must support 1GB of RAM

2. It must have screen size of 4 inch or more than that will be desirable.

3. It should be from sony or samsung only. Not the other 3rd class brand like micromax, lava, celkon'sss..Please..