If You are thinking to buy Xiomi 3s prime then I will suggest you to buy this phone compared to this to the redmi 4a , They Are Mostly same But Only Diffrence between in is Battery Capacity xiomi 3s has 4000mah Battery and 4a has 3000mah thats Main Diffrence between them .if you have more battery , then 3s best and Have u more more power saving Device Redmi note 4 is best .
NOW THE specifications Of Redmi 3s prime
5 HD screen
3GB RAM ( 1.4GB FREE)
16GB STORAGE ( 11GB FREE)
1.4GHz Processor
13MP Rear and 5MP Front with Led flash
IR blaster
Fingerprint Sensor
4GLTE, wifi Bluetooth Etc
Android Marshmallow 6.0.1