General :
His previous phones were from Vivo/Motorola/OnePlus (currently using, screen developed black spot one morning) and ha has been pretty disappointed in these because all of them developed some issue within the 1st year - like speakers cracking, touch problems, green line on screen, etc. He had an HTC Desire 650 (IIRC) and that phone lasted so long before it fell from stairs

His HTC Desire 650 lasted close to 5 years and every mobile since that has developed some problem in the 1st - 2nd year.
eSIM - nice-to-have.
(e.g.) Minimum 12GB RAM & 256GB Storage (or) Should be able to handle <number of apps> in the background & more than <your current storage>.
(e.g.) No (or) Yes, up to 1TB. A Hybrid slot is fine; Dedicated slot would be better.
(e.g.) Better than SD870 (or) Better than <current(or)any smartphone>.
(e.g.) Compact, AMOLED, FHD, 120Hz (or) Better than <current(or)any smartphone>.
Budget -
What is your budget? Mention Locality/Currency & Price Range.
INR ~ 20k, can extend a little if it is worth it, otherwise would prefer to stick to the current price.New or Used? Online or in-store?
New. Offline > Online (depending on pricing and availability).
Brand -
Do you have any brand preference or dislikes? Please name them.
Don't want a Oppo, Vivo, OnePlus, Motorola, etc. phone because poor build quality, does not last more than 2 years (to let members know what you're trying to avoid).His previous phones were from Vivo/Motorola/OnePlus (currently using, screen developed black spot one morning) and ha has been pretty disappointed in these because all of them developed some issue within the 1st year - like speakers cracking, touch problems, green line on screen, etc. He had an HTC Desire 650 (IIRC) and that phone lasted so long before it fell from stairs
Usage -
What is your intended use?
Casual - Calls and SMS/WhatsApp.What is your expected battery backup?
The more, the better. Hardly any significant screen-on-time. Like 1 hour per day by my crude guess.How long are you intending to use this phone?
Should run fine for 4-5+ years. (Most important point).His HTC Desire 650 lasted close to 5 years and every mobile since that has developed some problem in the 1st - 2nd year.
Connectivity -
What is your preferred network?
4G/5G (nice-to-have)What is the number of connections required?
Dual SIM.eSIM - nice-to-have.
Platform :
Operating System (OS) -
Do you have any OS preference?
Android.
RAM & Storage -
How much RAM and Storage do you want?
Not significant.(e.g.) Minimum 12GB RAM & 256GB Storage (or) Should be able to handle <number of apps> in the background & more than <your current storage>.
Do you want a memory card slot?
Not significant.(e.g.) No (or) Yes, up to 1TB. A Hybrid slot is fine; Dedicated slot would be better.
Processing power -
If you have an idea of how much processing power you'd need mention here, else feel free to ignore.
Not significant. (Should be able to run WhatsApp)(e.g.) Better than SD870 (or) Better than <current(or)any smartphone>.