Adding Additional GSM Frequencies Possible?

"Nabil" <public@laoudji.com> wrote in message
news:cag4to$8f7@odbk17.prod.google.com...
> I'm purchasing a Sony Ericsson T637 mobile phone which broadcasts only
> in GSM 800 / GSM 1800 / GSM 1900. Unfortunately, a country which I
> visit yearly only has GSM phones working in the GSM 900 range. Thus,
> I'm wondering how difficult it would be for either me or the
> manufacturer to allow the phone to be quad-band, and add on another
> frequency. Is this something that can be achieved by flashing the
> phone, or is this a physical limitation - ie a specific part that
> broadcasts at GSM 900 that can only be added by the manufacturer? I
> would appreciate any insight you may have.

You've been burned by the so-called "tri-band" phone. Just leave it in the
US and get a dual-band European model or tri-band with 900 MHz.

--
Donald Newcomb
DRNewcomb (at) attglobal (dot) net

In article <sscrc09gm5ptjd5dg1kjoeds9da317v02a@4ax.com>, Joseph wrote:
> On Sun, 13 Jun 2004 21:40:58 -0500, "Donald Newcomb"
><DRNewcomb@attglobal.NOT.net> wrote:

> If it's 1800 Mhz it should work at least on some networks in Europe.
> Some networks in Europe are only 1800 Mhz and others use 1800 Mhz for
> capacity.

Almost every country in Europe has both 900 and 1800 mHz GSM. Most of
them have their cheaper networks on 1800mHz.

Note to the original poster. I would not throw out the the phone yet. If you
only vist there once a year, by the time you visit them again they may
have 1800 mHz service. Because some operators use it for capacity, they
don't necessarily advertise it.

For example, in Israel, Cell-Com operates an 800 mHz TDMA and 1800 mHz
GSM netowrk. Orange operates both an advertised 900 and an unadvertised
1800 mHz network (900 full coverage), 1800 in high usage areas.

Neither company has coverage in the Palestinian Authority because they
are not licensed there. However, the leakage from the legal areas covers
just about all of the West Bank, and some of Gaza.

Geoff.
--
Geoffrey S. Mendelson gsm@mendelson.com

"Nabil" <public@laoudji.com> wrote in news:cag4to$8f7
@odbk17.prod.google.com:

> I'm purchasing a Sony Ericsson T637 mobile phone which broadcasts only
> in GSM 800 / GSM 1800 / GSM 1900. Unfortunately, a country which I
> visit yearly only has GSM phones working in the GSM 900 range. Thus,
> I'm wondering how difficult it would be for either me or the
> manufacturer to allow the phone to be quad-band, and add on another
> frequency. Is this something that can be achieved by flashing the
> phone, or is this a physical limitation - ie a specific part that
> broadcasts at GSM 900 that can only be added by the manufacturer? I
> would appreciate any insight you may have.
>
> -Nabil
>

Who use GSM 800 ?
I know of 850 900 1800 1900 but never heard of GSM 800.

"Joseph" <JoeOfSeattle@yahoo.NONOcom> wrote in message
news:sscrc09gm5ptjd5dg1kjoeds9da317v02a@4ax.com...
> If it's 1800 Mhz it should work at least on some networks in Europe.
> Some networks in Europe are only 1800 Mhz and others use 1800 Mhz for
> capacity.

Right, it's fine in most of UK but what good does that do in Morocco or
Egypt, or much of Ireland? Many GSM countries don't yet use 900 and some use
it only for expanded capacity in cities. No, you get very far off the main
road in many countries and 1800-only is useless. I wouldn't even bother
taking a phone like that with me.

--
Donald Newcomb
DRNewcomb (at) attglobal (dot) net

In article <Xns9508AF7BA8365someonesomewherenet@207.181.101.1 2>, Just Me wrote:
> "Nabil" <public@laoudji.com> wrote in news:cag4to$8f7
> @odbk17.prod.google.com:
> Who use GSM 800 ?
> I know of 850 900 1800 1900 but never heard of GSM 800.

800 and 850 are used interchangably to refer to the same band

--
David Van Cleef - Engineering Manager
dvc@gol.com - Fusion Network Services, K.K.
dvc@aeug.org - Global OnLine Japan
-- "We have forgotten at least two things..." --

>Who use GSM 800 ?
>I know of 850 900 1800 1900 but never heard of GSM 800.
>
>
>

In the USA we use 800 and 1900. Someone along the way decided to call 800 850
so now it is used interchangably.

Take a look at Phone Scoop (http://www.phonescoop.com) for a breif explanation
of 800.

--
John S.
e-mail responses to - john at kiana dot net

"Joseph" <JoeOfSeattle@yahoo.NONOcom> wrote in message
news:cpttc0ttotf3ats4hgmnos61kn7d3d1c51@4ax.com...
> True, but do you know their itinerary? They may be going to just the
> cities or they may not be going to Morocco or Egypt and may be going
> to places that use 900 or 1800. It all depends on where they're going
> as to whether it might be useful for them.

"Nabil" <public@laoudji.com> wrote in message
news:cag4to$8f7@odbk17.prod.google.com...
> I'm purchasing a Sony Ericsson T637 mobile phone which broadcasts only
> in GSM 800 / GSM 1800 / GSM 1900. Unfortunately, a country which I
> visit yearly only has GSM phones working in the GSM 900 range.

I think he answered that question in the original post.
--
Donald Newcomb
DRNewcomb (at) attglobal (dot) net