My friend was planning to buy an iPhone 5S for his primary phone for ₹4500
He only uses WhatsApp, YouTube, and Twitter.
in 2023 its not good idea to buy iPhone 5S bro. upto iPhone 6S UPI wont work. additionally iPhone 5S mostly have non genuine battery inside. which will definitely a trouble with over heating and fast battery drain. so his experience will not be good for one day usage.
Suggest him to get some good android phone for now. in future, if budget is the reason here, then consider iPhone XR or 11 type of model will be good for satisfying usage.
Also, Apps like Facebook, Youtube wont be supported in older iPhone models. I hope it helps to decide.