A handy tool to measure the data usage or bandwidth of wifi, 3g, and gprs.
Save your monthly consumption on data transfer.
Real-time detect the data usage of your ipod/iphone.
ios 4 tested
Features:
3G, GPRS, WIFI supported
ipod touch/iphone supported
multi data types:byte, kb, mb, gb
manual reset enabled
manual correction enabled
plan/paying cycle setup
data usage color alarm
data usage overload reminder
(*)update for iOS8
iChecklist 
Bandwidth Pro 
eTransfer 