Alltel ppc6800 crappy internet

[spatterfree]

Hi all, this is my first post in the site, i tried a few others but they are clueless with my problems....i'll post them separately...
Problem one...My alltel ppc6800 that i resently updated to WM6 has very crappy internet, like internet is connecting and trying to do somehting and after loading a few pages it just displays this page cannot be found and i refresh a few times and all i get is the modem disconnects and says that username or password is wrong....is there a fix for that error? i know it's worthless right now because i can hardly use it and most of the time i really can't open a page...please let me know what i can do to fix this error...
the connection i'm connecting to is the #777 that alltel has in the phone through cell line that uses minutes.