India

Vodafone
APN settings
 * username: (blank)
 * password: (blank)
 * APN name: www

Airtel
APN settings
 * username: (blank)
 * password: (blank)
 * APN name: airtelgprs.com

BSNL
APN settings
 * username: (blank)
 * password: (blank)
 * APN name: bsnlnet

MTNL (Postpaid)
APN settings
 * username: mtnl
 * password: mtnl123
 * APN name: mtnl3g

MTNL (Prepaid)
APN settings
 * username: mtnl
 * password: mtnl123
 * APN name: pps3g

Tata Docomo
APN settings
 * username: (blank)
 * password: (blank)
 * APN name: TATA.DOCOMO.INTERENT