Using the phone on other networks.

Hey guys i have searched for this through the threads but cant find an exact answere. I have a E51 that was from Finland, I know there are diff models from diff areas, I live in the US and the phone is unlocked, on Tmobiles network, Tmobile works in Tahiti, but when i was down there i had no signal, at all, when i go into my network settings:
Dual Mode
UMTS
GSM
I have it set by default at Dual Mode, from what I understand is that the E51 is a world phone which works on most GSM bands, and if i set mine to GSM it should pick up all GSM bands, but in Tahiti I had no service whats so ever, not that im complaining the break was nice, but I am worried if I will have that same problem when traveling to other parts of europe or asia. any advice? do others have the same options? or do i need to get a better software or is this just way off wack? please help .
alex

from Tahiti.com:
Tikiphone uses a GSM 900 network standard but some operators do not use the same frequencies or bands. Therefore, to make sure your mobile will work on the Vini network, you should get a dual band (GSM 900 / 1800) or a tri band (GSM 900 / 1800 / 1900).
If you can see any providers in your "Operators Selection" you are online, but your provider has no agreement with any Tahiti one.

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