ATT has a specific range (32.*.*.*) reserved for devices on the EDGE network.
I found some info in the ATT forum, but nothing more specific (but one
of the posts said ATT owns the 2.0.0.0/8 range)

I looked in my Apache access logs and most of the requests with a
User-Agent of iPhone come from 32.175.*.* or 32.172.*.* or some other
IPs around there.

Roaming may still work. I had the "pleasure" (at a very high cost!) of
roaming on EDGE from Europe and I was able to access some server
configured to allow iPhone access to resources normally accessible
only via VPN, and all I can think is that they monitor the IP
addresses (I cannot access the same resource when on wireless)

Of course iPhones sold to other providers (Europe, Canada, etc.) will
have different IP addresses, but   it would be easy to setup the
service to support multiple ranges, and to add more ranges once they
are known.

-- Raffaele



On Jan 23, 2008 11:00 PM, Ishan Anand <[EMAIL PROTECTED]> wrote:
>
> This is an interesting outside the box solution...but doesn't ATT also
> sell DSL internet access? So conceivably WiFi users connected to ATT
> DSL would also map to the same IP range (unless of course, we knew the
> precise IP range of the EDGE gateways).
>
> Also, if a user is roaming on EDGE, wouldn't they show up under that
> network's IP range (e.g. T-mobile, etc.) rather than Cingular/ATT?
>
> Best,
> Ishan
>
>
> On Jan 23, 2008 4:58 PM, Raffaele Sena <[EMAIL PROTECTED]> wrote:
> >
> > if you have a server, just add a simple service that returns you the
> > client IP or hostname or does the check for you (if it has an the
> > ATT/Cingular hostname or it's in the ATT/Cingular IP range it's on
> > edge)
> >
> > if you are delivering your app from your server, you may be able to
> > add the extra info to your page via server-side include or something
> > like that.
> >
> > -- Raffaele
> >
> > On Jan 23, 2008 3:45 PM, awaybbl <[EMAIL PROTECTED]> wrote:
> > >
> > > On thinking about it... perhaps a dumb way to do it might be to send
> > > something to the client, and time how long it takes. But that means
> > > wasting time to check to see how long something takes before actually
> > > loading your real code.
> > >
> > >
> >
> > > On Jan 17, 4:44pm, gateway <[EMAIL PROTECTED]> wrote:
> > > > Anyone know if their is a way to detect if the user is using wifi or
> > > > edge to connect to your site?
> > >
> > > >
> > >
> >
> > >
> >
>
> >
>

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