SIMM

I called Sprint got my unlock code but now I don't know how to put it into the phone to unlock the carrier and or other restrictions will somebody please explain to me the instructions of doing so? Please and thank you!

I have a Dell Inspiron 5100 that I'm repairing for someone. I'm trying to install 2GB of RAM (two 1GB simms.) I've now got two different sets of RAM that when I put them in, the laptop turns on but the screen stays black. When I put the existing 512MB simm back in it turn on fine. When I...