Manual 3G GPRS Setting of different Networks:

Below is the list of all network 3G gprs settings.
AIRTEL
AIRCEL
IDEA
BSNL
VODAFONE
DOCOMO
RELIANCE
ACCESSNAME
MOBILE
OFFICE
POCKET INTERNET
IDEA
BSNL
VODAFONE
DOCOMO
RELIANCE
HOMEPAGE
User choice
User choice
User choice
User choice
User choice
User choice
User choice
USERNAME
BLANK
BLANK
BLANK
BLANK
BLANK
BLANK 
BLANK
PASSWORD
BLANK
BLANK
BLANK
BLANK
BLANK
BLANK
BLANK
PROXY ENABLED
YES
NO
YES
YES
YES
YES
YES
PROXY & SERVER
100.1.200.99
-
10.4.42.45
10.0.0.10
10.10.1.100
10.124.94.7
-
ACCESSPOINT
NAME
airtelgprs.com
aircelwap
internet
bsnlwap
portalnmms
TATA.DOCOMO
.INTERNET
rcomnet
PROXY & SERVER PORT
8080
8080
8080
8080
9401
8080
8080
DATA BEARER
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS
GPRS

 Note: In the above settings Access Point Name is very important for Mobile internet access.

Below are the simple GPRS setting
Go to Settings and connections and create new setting with the below values

Manuall Settings

AIRTEL

Proxy Enabled                        NO
Access Point Name            airtelgprs.com

AIRCEL

Proxy Enabled                        NO
Access Point Name           aircelwap/aircelgprs/POCKETINTERNET


IDEA

Proxy Enabled                        NO
Access Point Name           internet


BSNL

Proxy Enabled                        NO
Access Point Name           bsnlwap/bsnlnet/bsnlgprs


VODAFONE

Proxy Enabled                        NO
Access Point Name           portalnmms


DOCOMO

Proxy Enabled                        NO
Access Point Name           TATA.DOCOMO.INTERNET


RELIANCE

Proxy Enabled                        NO
Access Point Name           rcomnet

Note: Any of the above settings can be used for mobile internet