OK, so here is the issue. I have several MBP's at my office. They can all connect to my wifi in the office and elsewhere no problem. However, when I try to connect one to a VZW MiFi 2200, they state that they are connected but the IP address doesn't change from the one assigned by my WIFI. The Macbooks will not connect to the internet, I cannot even navigate to the config page on the MiFi device. I have tried everything I can think of. I have deleted every plist associated with internet/airport and reset. I have reset the PRAM and NVRAM. I have deleted all the airport connection and reinstalled it. I have created new locations. I have even reformatted one of the MBPs and tried to connect to the MiFi. I have tried 3 different MiFis (2 were updated with all the latest software/firmware, the 3rd was out of date). Nothing works. I have no problem connecting to the MiFi devices with my windows machines, or from Windows on bootcamp. I am pulling my hair out over this as I have several MiFi devices that are nearly worthless for me. Any suggestions would be greatly appreciated.