How do you change a sim card in a cell phone? what all goes into it?

i have a blackberry phone. im looking to get a new one thats unlocked. how do i change a sim card? be very detailed in your discription of what to do.How do you change a sim card in a cell phone? what all goes into it?
well im not an expert when it comes to blackberries, but the first step should be to take of the back cover on the cell phone. u should maybe turn it off first. Then look around for and small chip that is only showing about 1/8 of its real size, and the rest of it is inside the phone hiding. if you do not find it take the battery out and it should be somewhere their. then once you've found it either pull it out or if that doesn't work push it in word so that it clicks out itself. don push or pull to hard enough to break it.

Good luckHow do you change a sim card in a cell phone? what all goes into it?
Remember when you were at the store and they put in a small chip about half an inch by a quarter inch inside the back, then slid on the back cover? That's your sim card. Normally it's behind the battery. You need to turn off the phone, then side off the back cover and remove the battery. The card should be white, I think. CAREFULLY and SLOWLY pull it out, and bingo. There it is. Or you might be able to take your old phone with you and have them do it.