BUT while reading yours, I had this thought..
I know some phones/companies had the feature of auto-configure the network setting by receiving a special SMS. The problem is that you had to send a sms in order to receive it I think.
But, if you know your sim phone number maybe you can ask your provider to send such SMS, and wish for the VITA to honor and apply the new setting.
It's a long shot, but also was social engineering on AT&T employees...
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