850Mhz wasn't approved by the FCC:
http://www.phonescoop.com/phones/fcc_query.php?gc=EUN&pc=GTA01BV4

If they are shipping a quad band, it is currently illegal in the US. That may have something to do with it.


Benjamin Flanagin wrote:

I started out with a 73000 O 4021 G3 sim card from cingular witch would
not connect to the at&t network in my area. There are a few people that
have gotten this card to work. Using the list on the wiki I purchased a
known good sim [model number 71234 O 4022]. The phone will now return
the proper information to all at+ commands but is still rejected by the
at&t network. Talking to one of there support personal I was informed
that my area only supports 850mhz gsm. They also informed me that my
phone only supports 900-1900 mhz how that know that Im not sure.

Is there a way to manually set the gsm modem to 850 mhz? Shouldn't it
auto detect all networks not just 900 and above?

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