If you are looking for a new mobile I will give you some new tips.
Look mobiles under your budget.
Buy a android smartphone. Do not buy any other operating system mobiles.
Buy that mobile that comes with minimum 3000mAh battery.
Buy that mobile that comes with minimum 32 GB storage.
Always look for 2gb or more ram.
Buy a branded mobile like Mi, Samsung, Nokia etc.
I hope these tips use full for you.