Post by WilHi Harry. there were some gripes that unlocked v3i phones didn't work
with alltell (sp?) and two other carriers in the states. some people
weren't happy because they purchased them from ebay...
The network doesn't know if your phone is locked or not. This is an
intimate handshake between the handset and the SIM card well before any
connection to the mobile network is made.
The network does get to see what type of phone you have. And the
network operate may decide that they woll not SUPPORT your handset
because their agents don't have access to that handset's manuals , nor
special network functions to upgrade your particular handset.
HOWEVER, consider the following: when a visitor from a foreign country
roams into their territory with that handset and a foreign SIM card,
they will happily let that handset work and collect the lucrative
roaming fees. But they don't have to support it nor help you debug
issues a traveller may have.
But if you insert one of their SIM cards in the handset, they gain a
certain amount of responsability for support since you become of of
their customers. If you don't tell them you have an unlocked handset and
just get the sim card, it should work. But you're on your own to
configure the handset for most of the additiona parameters outside the
SIM card.