Q: When I put the pin into the hole the card tray wont oopen

You have to push SIM ejection tool in firmly to eject the tray.

You need to use -some- force to eject the card as it's not spring loaded as you may be expecting. It's a friction design and you need to overcome the friction that holds the SIM card tray in place. For the iPad 2,3 & 4, you also need to push the tool it in at a 45 degree angle...see the following (scroll down to the iPad section):

http://support.apple.com/kb/HT5163