Here's how to change APN settings on an Android mobile phone
From the home screen, tap the Menu button
Tap Settings
Tap Mobile networks
Tap Access Point Names
Tap the Menu button
Tap New APN
Fill out the APN detail as per below
Tap Save when done
2talk APN Settings
APN Name: 2talk
APN: apn.2talk.net.nz
Proxy: [not set]
Port: [not set]
Username: [not set]
Password: [not set]
Server: [not set]
MMSC: [not set]
MMS proxy: [not set]
MMS port: [not set]
MCC: 530
MNC: 05
Authentication type: PAP
APN type: default,supl
APN protocol: IPv4