Things I Do Not Get, 1

When I call a number on my cell phone, if I disconnect that call before the number picks up, my phone reverts to a screen that offers me the option of immediately calling that number right now again even though I just hung up on that number.

Why? WHY PHONE? Why would I want to call that number back RIGHT NOW? Why would that be the very next thing I wanted to do? It's like the phone thinks that was a test run.  *phew. OK. I can successfully dial the number.  All right. LET'S DO THIS.*