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How to change APN and MMS settings on the Apple iPhone 3GS?

i need to setup my data for an iphone 3gs for chatr

Tap on Settings > General > Network > Cellular Data Network.

For chatr data:
The data APN is chatrweb.apn

For chatr MMS settings:
The MMS APN is chatrweb.apn
The MMS URL is
The MMS IP address is
The MMS port is 8080

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