Set Blackberry Network Connection
-Settings->Network Connection
Choose GPRS,BIS,BES,Wi-Fi as per availability
(Most of the time setting it to BIS works) 

GET "GPRS" SETTINGS OR ACTIVATE "GPRS" ON YOUR MOBILE.USE THIS INFORMATION AT YOUR OWN RISK.CONTACT YOUR OPERATOR FOR MORE ACCURATE INFORMATION AND DATA PLANS.
(Updated on 9th March 2011)

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VODAFONE Live:
Postpaid customers: sms ACT VL to 111 (toll free).
Mumbai customers need to sms ACT VLZERO to 111 (toll free)
Prepaid customers: sms ACT VL to 144 (toll free).
Customer care: 198(tollfree)
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TATA DOCOMO
for settings sms INTERNET to 52270
customer care 121
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RELIANCE
for settings sms ALL to 55100 
customer care CDMA postpaid:   *222
customer care CDMA prepaid:  *333
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AIRTEL
for settings sms ALL to 54321
customer care:  121
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AIRCEL
for settings sms GPRS BP <handset name first 3 charaters> <phone model> to 57788 
Example: GPRS BP NOK 6300
customer care:  121
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IDEA
for settings sms SET to 54671
for activation sms ACTGPRSZERO to 12345
customer care: 9702012345
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MTNL Customer care
GARUDA	1502  or   22221502
DOLPHIN / TRUMP	1503 or  9869012345 or  22221503
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DOLPHIN
for activation send sms GPRS to 555
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TRUMP 
for activation send sms ACT GPRS to 444
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MTNL Manual GPRS configuration to Access MTNL GPRS

*Profile Name: MTNL GPRS

*Homepage: http://mtnlmumbai.in

*Bearer: GPRS

*GPRS settings:
IP address: 172.16.39.10 
Port No: 9201 (Sony, Samsung, Motorola)
If Proxy Port: 9401 (Nokia,O2, other high end phones)

*APN (Access Point Name):                                                   
For Prepaid Enter: gprsppsmum 
For Postpaid (Billing) enter:  gprsmtnlmum

*User ID: mtnl

*Password: mtnl123

*Connection type: Permanent

*Security: Off/Normal/PAP(sony erricssion)