1. Budget?
A: INR 12-20k .
2. Preferred display size, type and resolution?
A: 4.7"-5.5", IPS LCD/AMOLED, FHD and above
3. Preferred operating system? (Android (with version), iOS, Windows Phone etc).
A: Android Oreo should be the least, with a promise of pie and updates for 2 years, shipping...