I have been desperately trying to come up with a solution for my
problem. I am trying to find a way to get a Nokia 8910i to work here
in the U.S. The phone was built with a dual band operation on EGSM
900, GSM 1800, and GSM 900/1800 dual-band networks in Europe, Africa,
and Asia.

I believe here in the U.S. we are GSM 1900. I do not wan't to give up
and just get a different phone. There must be a way. I have went so
far as to offer to pay Nokia to build me the phone to be used in the
U.S. with no luck. I would like you to find me the best solution I
have available to me. I am willing to pay a company of some sort to
rebuild the internals or tweak it to have it work here. It is not so
much the phone that I want, but more the actual exterior design of a
titanium casing that extracts to open. That means i'm willing to
consider a way to get that design onto my current phone which is a
Nokia 6230, although I would much rather prefer having it work in the
U.S. Nothing is impossible and I really believe there is a way to have
this done. I am aware of the difficulty of this situation, so take
your time with it if need be. Thank You in advance and don't hesitate
to ask for more details.

What is your zip code and service provider in the USA?  Some providers
use the European GSM frequencies espcially on the coasts where
european visitors are common.  It may be as simple as switching
providers to one that supports the 8910i's frequencies.  You're not
likely to get very far with changing the 8910 guts to work on the
other networks as the phone's antena is tuned to the frequencies. 
You're more likely to get a pop-open facia for a GSM 1900 phone if
you're restricted in your frequency choice, although finding a metal
one might be more diffucult than a plastic one.  I'm fairly certan
that a solution can be found.

Hello Josh, I am happy to hear a solution can be found. The zip code
the phone is primarily used is 19101 with T-Mobile. I am concerned
though because I travel constantly and am hopeful the solution would
not restrict me to certain areas of the U.S. I am leaning less towards
changing providers (although considering it) and leaning more towards
this "pop-open fascia" idea you have. To be honest, I am not familiar
with that term or process. Feel free to ask anything else that will
help find a solution. Thank You.

Also, you mentioned that it is mainly just the antenna that is the
source of the problem. Forgive my simplicity in finding a solution,
but would it be as simple as just soldering an antenna from say, a
6230 into a 8910i; replacing the original antenna?

I contacted a company that tells me they would have to examine the
phone to determine whether the diplexers can be swapped. He also
mention it could cost anywhere from $3-$300. That bit of information
might help narrow down the solutions possible.