I have a Verizon-branded BlackBerry Tour that I am only using for GSM/UMTS (ie: it will most likely never be used with Verizon). Verizon blocks the GPS from being used with unsigned 3rd party apps, so it can work with some apps, but not others. To remove this restriction completely, I'd like to completely erase all Verizon-related software on the phone. I did try downloading OS software from other carriers (US Cellular, SaskTel, Appalacian Wireless) and installed it on my phone via the RIM Desktop Manager, but still the GPS is locked, and still all the Verizon branding is there, including the "Welcome to Verizon" message (!!). ...what do I need to do to completely wipe out everything, and do a fresh install of (for example) a US Cellular OS?