10 Oct
2006
10 Oct
'06
1:40 p.m.
Alexey Toptygin wrote:
On Mon, 2 Oct 2006, Sean Conner wrote:
So there's no real way to distinguish between a mobile phone and a landline?
Gordon
But what about cell phones and roaming? Last
year I went to Las Vegas
with a friend of mine. My cell phone is in the 561 area code (Palm Beach
County), my friend's phone is in the 205 area code (Tuscaloosa, Alabama).
Las Vegas is 702. My Dad was able to call me (760) while I was in Las
Vegas, and I was able to call my friend (205 area code, although
phyically
five feet away) from my cell phone.
How do they handle *that*?
This is getting dangerously OT, but what the hell, I used to test these
things :-)
All calls from the PSTN to a particular cell number go to that number's
'home' switch. This switch owns the enclosing block of numbers in the
PSTN sense. It also keeps track of which switch is the 'serving' switch