Can the memory chip on the iphone be changed?

I have 16 gb on my iphone and i want 32, but i dont want to buy a whole new phone, i know its possible to change the chip, but is it cheap or expensive?

Added (1). I have an iphone 5?

Yes it can be changed i have the same i phone!

No. With the exception of the sd card reader for ipad. I don't think that works on a 4S and you'd have to check on a lighting adapter that I don't think is out for the 5 anyway. Your best bet is to look at cloud services. There are lots of apps that let you stream your music from home. Video as well.