The Audio Speakers of Oppo F1S is loud enough for a room entertainment. It's loud enough for a call or message notifications and watching movies or videos in a silent environment. As I live alone so normally play songs or watch movies and it serves my purpose properly but for more loud experience I will recommend you to buy some cheap and good Bluetooth speakers from this link: Bluetooth speakers.
Oppo, Vivo, Lenovo, and Xiaomi are the companies focussing on budget range smartphones. These are the companies holding most of the market. Following are the best phones by each of the company under Rs 20,000.
Oppo F5 is the most worthy Oppo phone under 20,000 price range. This device is priced at Rs 18,249 and is a premium smartphone with great performance and outstanding pair of cameras. It is powered by a 2.5 GHz Octa-Core processor and features a 16MP rear and 20MP front camera along with 3200mAh battery capacity.
Vivo V5 Plusis a great choice at the price of Rs 15,999. It is powered by 2GHz Octa-Core processor and features 16 MP rear camera and a 20MP +8MP dual-front camera and is truly a selfie expert. It has a battery capacity of 3055 mAh and also supports fast charging.
Lenovo P2is truly outrageous and you can buy it at just Rs 14,999. Apart from its fast 2GHz Octa-Core processor. It features a Super AMOLED display and has a huge battery capacity of 5100 mAh along with fast charging support.
Xiaomi Mi A1 is the most popular phone under Rs 15,000 and in the most worthy Xiaomi phone under 20,000 price range. It is priced at Rs 13,999 and also features a 2GHz Octa-Core processor. It features a 12MP + 12MP dual-primary camera and is really good at arranging field-in-depth effect.