Q: I bought an iPhone7 at full payment. I haven't got a sim removal tool in the box but in tutorials there is pin in the box..

If my memory is correct, with previous iPhone models the removal tool only came with the sim free version. I didn't get one with my iPhone 7. Also, it isn't shown in the "What's in the Box" section of http://www.apple.com/shop/buy-iphone/iphone-7

As described in the following you can use a paper clip: Remove or switch the SIM card in your iPhone or iPad - Apple Support