Cheap Smartphone should or should not? This is a good title, but I'd probably write it as "Cheap Smartphone: Should or Should Not?"

Nowadays, smartphones is a are common devices. Almost all people have them one. To approach the poor, some smartphone company companies show some of the cheapest models. With the cheapest prices, they try to support many features as they can. [not sure what you mean...did you mean to say "show as many features as they can"?] And this race is processing. [also not sure what this means] The cheaper phones are produced, the higher features they make to it [I would instead say "they are given"]. Maybe the poor are advantaged. However, cheap smartphones have some issues with lasting [or you can put "lasting a long time"] the using time. The display becomes blur, it appears many errors appear, and it becomes a slow process. Specialy, Especially, the capability of pins is declines quickly. Security is bad. The warranty time is short.
So that, I think that if you want to buy a new phone, Let's choose a median medium price [another way to say it is "medium-priced"] phone and this phone has a the prestigious reputation. Don't choose the cheap phone, because you will be annoyed and will change to a new phone early.
Thank you for reading my opinion. If you have another opinion, let's comment below this post.