Transferring data on a SD card to a micro SD card?

I have an iPhone 4 and as far as I know, it has a regular SD card. I want to buy a Docomo Fujitsu F-02D but it uses a micro SD card… I don't want to change phone numbers and I want some of my old data like my friends' phone numbers.

Also, would using the new Japanese phone I'm getting be a problem if AT&T is my provider? The phone would work fine outside of Japan (it's unlocked) but would AT&T have some kind of issues whit me?

IPhones have in built storage. You can't use any memory cards, unless you buy the camera adapter.

Hope this helps

Iphones don't take sd cards, do you mean sim cards. If so call your network and they will send you a new micro sim with your number and account details the same on it and then they deactivate the old sim card.