Is doing this worth it? Is it a smart idea?

I'm a 17 year old guy, African( Zambian). I use a Nokia Asha 210 dual sim. I bought it on the 18th of December last year. I've used it for a month and some weeks now. Yesterday i was bathing my dog and i had it in my pocket and it slipped out of my pocket silently and water was all over it. The water entered inside and the screen was full of it. I took it for fixing and it's well now, but it's showing signs that someone wiped the screen. Will the screen stop functioning? So I'm making this decision of selling it(not on ebay or some other site. I bought it at Zmk490(US$98) approximately. I love the iphone but i can't manage to buy it, cuz i don't have a good job. I want to buy a Nokia Asha 501. Is it a wise idea? Is the Nokia asha 501 a good phone? And at what price should i sell my Asha 210?
Note: Zmk means (Zambian kwacha) our local currency.

Nokia asha cost around 100-110 $ so you sell Asha 210 for 60-65$ you put an additional 40$ and here you have the new phone. I bet you can afford 40$

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