You will probably get abused in that next phone bill it sounds like full data.
What is your wifi set up? I had to make some signficant changes to get UMA to work consistently(without sounds laggy). Check out the 8820 or is it 8830 forum UMA issues.
Some routers work beautifully, some need tweaking, some need a replacement.
I use a dlink dir-825
Q10! <- Love the 9000!! It's everything I wanted (minus enough ON BOARD memory)!!
<-9700 ---! more memory! small screen&keypad :( ->