[comp.dcom.telecom] Cellular Roaming

covert%covert.DEC@decwrl.dec.com (John R. Covert) (10/31/88)

>A few cellular service providers now offer to let the roamer dial a
>call-forwarding-like feature access code from a roaming area, and
>have calls forwarded there, by the home system, at the roamer's
>expense.  This will probably become the standard.

Can you please provide examples of carriers who have actually implemented
this?  I certainly hope this does not become the standard; it's not very
good human engineering to require the cellular user to "do something" whenever
crossing from one system to another, or when getting off a plane in another
city or when returning to the home city.

Unless special trunks are installed between the two systems, the call-forwarded
call will probably have to be routed via the existing roamer access ports, which
go off-hook even when you don't answer.  If this "follow-me" forwarding becomes
the standard, lots of people are going to be annoyed by charges for unknown
incomplete calls.  Can you imagine how annoyed you would be if you had set up
follow-me forwarding, and then went into a poor service area.  Someone starts
persistently trying to call you on your home number, which is forwarded to you
via the roamer port.  They get charged for n calls to your number, even though
you didn't answer (and they didn't know they were calling a number that charges
with no answer), and you get charged for n long-distance calls from your home
system to the roamer access port.  And none of them completed calls.

>Cellular companies serving ajoining areas sometimes provide
>transparent automatic roaming service to each other's subscribers.

This has got to be what becomes the standard, not just to adjoining systems,
but throughout North America.  Currently it's only done with adjoining companies
because no one is taking advantage of the feature in the protocol which allows
a system to solicit sign-ons from telephones arriving in the area and because
there is no underlying signalling network to carry the calls.

Subscriber volume, especially of people with portables which they carry with
them cross-country, is what is needed to make this happen.  The number of
cellular subscribers doubled from 1 Million to 2 Million during the past year;
it is hoped to reach 18 Million by 1992.  Subscribers shouldn't have to put
up with what we "pioneers" have to do to use our phones when outside our home
areas.  It is unreasonable for me to have to give my secretary a list of twenty
or forty different numbers to try to reach me if I'm driving from Bangor to
Miami.  It's also unreasonable for me to dial a "follow-me" code every time I
cross an invisible system boundary.  My normal ten-digit cellular phone number
should work no matter where I am in North America.

/john

jensen@ames.arc.nasa.gov (Mark Jensen) (01/04/91)

I recently signed on with GTE Mobilnet for cellular service.  I have
heard that there are several different ways to obtain cellular service
while roaming in California, including " Follow Me Roaming".  I would
appreciate any thoughts or information that newsgroup readers could
provide on the diffrent types of roaming arrangements.

Thank you,

Mark Jensen


[Moderator's Note: Perhaps readers will correspond direct with Mark
and explain the different methods.   PAT]