How to change APN on jail broken iphone?

App? Cydia? How do I get the option to change my APN?

If you want to Enable MMS (and you have a jailbroken iPhone ) then install Tetherme from Cydia and you can go into the Settings->General->Network->Cellular Data Settings Menu and Edit them as below

Settings
Cellular Data
APN: att.mvno
Username:
Password:
MMS
APN: att.mvno
Username:
Password:
MMSC: http://mmsc.cingular.com
MMS Proxy: 66.209.11.33:80
MMS Max Size: 1048576
MMS UA Prof URL

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