Finally! I'm on EDGE. I was talking on the phone and it kept dropping the call.. I only had 1 bar.. It went on Searching for about 10 seconds.. Then it went into No Service for about 5 minutes. And here comes the EDGE. 
So yes, the 4S will and can switch to EDGE. Honestly, I wish I could stay on EDGE @ home.

So yes, the 4S will and can switch to EDGE. Honestly, I wish I could stay on EDGE @ home.