I have followed all of the steps on the stickied thread, but cannot get my unlocked Storm 9530 to work on AT&T. After removing vendor.xml, replacing the service books, etc. - every time I try to make a call it directs me to Verizon customer service. On my main apps list, it includes "Get ATT Navigator, "MEdia Net", etc, both AT&T applications. In manage connections, the phone is listed to as connected to Verizon Wireless even though I have a AT&T SIM installed in the phone. I do not know what I have done wrong, I am running the most recent official Verizon OS (5.0.0.328). Someone please help! Thank you.
Make sure you go to Manage Connections and go to Mobile Network Options and make sure Network Technology is GSM/UMTS and Network mode use 2G. It should work once it picks up the GSM Networks.