could i update my iphone 4 to ios 8

It can't be updated past 7.1.2.

(124664)

liyah_02 wrote:

so could i get a iphone 5s

Yes you can buy one at an Apple Store.

liyah_02 wrote:

can i trade this one for one

No, sell it yourself and buy a new iPhone with the proceed.

Use Apple's recycling program, or contact your carrier, or sell it to someone else.

(124665)

No. Apple does not do trade ins. You can sell your current iPhone and use the money to buy a newer iPhone. Alternatively you can use one of Apple's partners to Recycle your iPhone and get a gift card with a fraction of the iPhone's value that you can use to buy new iPhone.

http://store.apple.com/us/browse/reuse_and_recycle

Whether the company you bought it from takes it back in exchange for a new one is up to them. You would need to ask hem if they will do that. There's no way we could possibly know.

You are going to have to ask them if they will do that. How can we know when you never even told us where you bought it.