Experia Arc S Cannot Connect to AT&T 3G

[pcrkbr]

This is probably not a new issue but I appreciate any input.  I have been trying to set up a new Xperia Arc S to work on ATT's network.  The phone works fine, it will send text and access internet while in a wireless area but it does not recognize or is not recognized by ATT's 3g network.  In talking with ATT multiple times, I have not found the answer and during the last call, the individual said they do not support non-ATT phones.  The model is LT18a.  Any suggestions?  Thanks!

[pcrkbr]

Well that did not work...the three Update Service SUS links you sent....

[Uliwooly]

so it might be the SIM card then.

is Sony spying on users in this forum?

http://talk.sonymobile.com/thread/60197

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UNRELATED topic, if you have some time please check this thread

http://talk.sonymobile.com/message/244522#244522

[pcrkbr]

uliwooly....yea!

The phone appears to be working now ...at least it is surfing the web riding down the highway ... so that is a good thing.  I think it was a combination of A) updating the software to the lastest version and B) removing mcafee  THe sim card was not replaced but once I updated and removed that program, it began working...Thanks!