Ways to take care of your touchscreen smartphone-
Always keep your phone in a safety case especially when walking or when outdoors. If your phone fells and there is no cover, its screen will break and will charge many rupees to repair it and it will never be the same again. Touch and speed will also reduce. Natural white light of phone will be replaced with yellowish light, which is not good at all.
So please keep this in mind. Another tip is that always trim your nails beforehand using phone. If your nails are long and you use a touchscreen phone, the touch will get broken. Scratching appearing on the phone screen is another problem when using touch screen phone with long nails. So please trim your nails before using touchscreen phone. Always touch the screen with the pads of your fingers and not nails.
Try to keep the display light as minimum as possible as excess of blue light coming from the phone screen will adversely effect your eyes and can even hurt your eyes in later condition