IPhone 4 8gb conversion to a 16gb Memory slot! Help?

Hi, i have a iPhone 4 that i want to take somewhere for them to convert the memory slot to a bigger one, because i have used my whole slot already? So i don't know what to do, i just bought the iPhone brand new and i just want a bigger slot, does anybody know somewhere i can take my phone to?

Impossible.

You can't do that

You don't have a memory slot in your phone. You only have what ever memory was made on the mother board at the time of manufacture. That is why you buy them with different sizes of memory.