Mobile phones for 10~20k budget

Few things to remember ( > means greater than)

1) As per businessinsider Airtel supports the following 5G bands in India900 MHz (n8), 1800 MHz (n3), 2100 MHz (n1), 3300 MHz (n78), 26 GHz (n258) and Reliance Jio supports the following 5G bands in India –700 MHz (n28), 3300 MHz (n78), 26 GHz (n58). (Texts are copied and reformatted from that link)

SA/NSA -> Article

2) VoNR -> Voice over 5G/New Radio -> If not supported then network will switch from 5G to 4G in order to be able to on VoLTE during call.

3) 8bit -> 16 million colors, 10 bit -> 1 billion colors, 12 bit -> 68 billion colors

but as per Pantone Researchers estimate that most humans can see around one million different colors. As per this article Scientists estimate that humans can distinguish up to 10 million colors. As per another article by BBC "...tetrachromats might see 100 million colours."

4) Display Protection -> Despite of tall claims by brands they don't share the level of protection is offered. Let's take an example of Corning Gorilla Victus 2. As per its spec sheet, standard thickness varies from 0.4~1.2mm. So, don't do Gorilla thing with your phone. 

5) OLED degrades over time. SAMOLED > AMOLED > OLED.

PWM is used to control brightness. Point to be noted. Low PWM is going to give trouble to people with sensitive people.

6) LPDDR5 > LPDDR4  

7) UFS 4 > UFS 3.1 > UFS 3.0 > UFS 2.2 > UFS 2.1

10 ~ 20k

LAVA Blaze 2 5G with Dual Sim|50MP Rear Camera|5000 mAh Battery|Expandable Upto 1 TB (Glass Blue, 128 GB) (6 GB RAM) 10880 (5G bands: n1/n3/n5/n8/n28/n41/n77/n78 SA/NSA), UFS2.2 ROM, LPDDR4, Mediatek Dimensity 6080, 6.56" 269 PPI IPS curved HD+, 203gm -> Rs10880

POCO M6 Pro 5G (Forest Green, 128 GB) (5G bands: n1, n3, n5, n8, n28, n40, n78 SA/NSA), LPDDR4X 6 GB RAM, UFS2.2 ROM,  Snapdragon 4 Gen2, 6.56" flat IPS FHD+ Adaptive Refresh Rate (30, 60, 90 Hz), 199gm, 18watt charging and 5000 mAh battery, IP53 rating -> Rs10999 

Motorola g54 5G (Mint Green, 128 GB) (8 GB RAM) (5G bands: n1/n2/n3/n5/n7/n8/n20/n28/n38/n40/n41/n66/n77/n77/n78), 405PPI FHD+ IPS 120Hz panel, IP52, 177gm, no idea about type of RAM n ROM used here, maybe LPDDR4x and UFS2.2 ROM, 6000 mAh battery, Mediatek Dimensity 7020 -> Rs13999

SAMSUNG Galaxy F15 5G (Groovy Violet, 128 GB) (6 GB RAM)  (5G bands: n1, n3, n5, n7, n8, n26, n28, n40, n41, n66, n77, n78 SA/NSA/Sub6), 396PPI SAMOLED 90Hz display (I was disappointed about that 16million display, but after checking different scientific reviews I have found that it's adequate for the most of us), no idea about RAM and ROM, Mediatek Dimensity 6100+, 25 watt charging and 5000 mAh battery, 200gm battery ->14499 (Charger needs to be purchased separately ) ->Rs14499

POCO X6 Neo 5G (Horizon Blue, 128 GB) (8 GB RAM) (5G bands: N1/N3/N5/N8/N28/N40/N78), Mediatek Dimensity 6080, 10 bit 6.67" FHD+ AMOLED 120Hz display, 33 watt charging and 5000 mAh battery, 175gm ->Rs15999

realme 12 5G (Twilight Purple, 128 GB) (6 GB RAM) (5G bands n1, n3, n5, n8, n28, n40, n41, n77, n78 SA/NSA), Mediatek Dimensity 6100+, LPDDR4X 6GB RAM, 392PPI FHD 6.72" 120Hz display, 45 watt charging and 5000 mAh battery, IP54, 188gm -> Rs16999

POCO X6 5G (Snowstorm White, 256 GB) (8 GB RAM) (5G bands N1/N3/N5/N8/N28a/N38/N40/N41/N77/N78), Snapdragon 7s Gen 2, 5100mAh battery, 12bit 446PPI 2K AMOLED 120Hz (30/60/120 Hz adaptive), LPDDR4X 8GB, UFS 2.2 256GB ROM -> Rs20999

LAVA BLAZE Curve 5G (GLASS IRON, 128 GB) (8 GB RAM) (5G bands n1/n3/n5/n8/n28/n41/n77/n78 SA/NSA) 6.67" AMOLED Curved Display, Mediatek Dimensity 7050, 5000mAh battery, 189gm  -> Rs20399

This is too hectic to sort everything. I thought that it will be an easy task. 

See, prefer flat displays. Curved displays are garbage in my personal opinion. Nobody beats Samsung in terms of Battery backup, android updates and network connectivity. Poco is unbeatable at giving good specs at low price. Every brand suffers from motherboard issues. Some influencers choose to target particular brands to create a hype. That's nonsense. Ex Realme, Oneplus, IQOO, Realme, Moto phones with OLED panel have suffered from green line issues. Apple was able to fix it. Poco phones did not suffer from that. Even Samsung has been caught cheating while boasting to capture moon photo. Old Exynos equipped Samsung phone's motherboard got damaged while performing software updates. Samsung slows down phones with OTA updates. I saw a repair video where Asus Zenbook did not start because its battery was dead (I know laptops are not phones). Phones will last for about 3-4 years. That's it. Putting a backcover helps. Putting a screenguard/tempered glass reduces experience. I don't use any sort of protection on my phone's display. @ManojSingla

I skipped a lot of phones. So many variants are there. I have entirely missed to talk about whether they have 3.5mm jack and their camera quality.