27-01-2011 08:15 PM - edited 27-01-2011 08:15 PM
Not found on outside of MIUI, which is a shame (unless there are paid for apps on the Market)
ROM: 3.14.401.31 (JRO03C)
HBOOT: 1.39.0000 | Recovery: Stock
Radio: 5.1204.162.29 | Kernel: Stock
30-01-2011 03:49 PM
Many people use 3G Watchdog, though I can't comment on how good/bad it is as I was put off installing it after reading about some people having problems with it.
So on my HTC Desire I've installed "Stats Free" - it's simple and tells me all I need to know, including mobile data usage. You can also set the threshold at which it warns you.