actually if u know how to track ur Data usage , it wont give u a shock bill , 4 of my family include me under ivalue1 never get shockbill within this 4 month
for the 1st month , control urself not using more than 30mb per day , because the 1GB data plan is not given with full month cycle , maybe u register ur iphone on 24/1/2011 , it will be 28/1/2011 for billing date , so for the 1st month it should be
[1GB/31day] x 5 day(from 24~28) = 161MB , once u over 161mb , then u will be charge , hence u get shock bill....
so u better call up 123 to double confirm WHEN is ur Billing date , u can change the story =)
if let say u know ur billing date is every month of 28th , so just reset ur data on 29th , and use it safely until the next month of 28th

normally will get shockbill on the 1st month because alot of user dunno the BILLING date , so they over use the data and get charge higer
This post has been edited by chongkiatz: Jan 25 2011, 12:28 AM