some people told me that there is a flash memory and mp3 player together (2 in 1) .. is this true ?

Answer 1

Yup I believe this is the one you are talking about: Creative's Muvo

Link: http://www.creative.com/products/product.asp?category=213&subcategory=215&product=15441

It's a 2 piece design, hence 1 piece looks just like a usb key.

Answer 2

There are your Mobil Phones that have a Built In MP3 Player and the ability to have your music on a memory stick so you can add/remove all the music you want and have a phone as well.

Then there are the MP3 Players that have the ability to use a memory stick (or flash memory) to store music on for you also :)

Answer 3

you can use most mp3 players as a flash memory stick, my son has several and he can use them all as flash memory sticks