i've had my phone for a while and use to send texts on it. then one day i hooked it up to the desktop manager and it no longer let me send texts. i can receive them, but when i try to reply or even send a new one, its not even in the options. any ideas why? also, before i never had to enter a password for my phone. i tried to disable it on the security menu and it has a little red lock next to it and it won't allow me to change it!!!