My Service Provider's 3G Networks are 1900/2100
My BlackBerry Bold from T-Mobile is blocked to 2100 ONLY so switching from 2100 to 1900 is causing a self reboot.
so, i de-branded my BlackBerry Bold Since T-Mobile Devices gives you only 2 options 2G or 2G&3G Now after de-branding i got 2G, 3G or 2G/3G
i did the de-branding 3 days back and kept it to 3G Only... so far No Reboots, No Drop Calls
only Battery is running so fast.. but it's ok since i have a chargers everywhere