TelstraClear MMS APN Settings for iOS 10

From main menu, select Settings and then Cellular.

Check that Cellular Data is turned on.
Tap Cellular Data Options and then Cellular Data Network. 
(If this setting does not appear it cannot be configured manually. Please contact the seller.)

Enter the below details in MMS section: APN: wap.telstraclear.net.nz Username: Password: MMSC: http://telstraclear.nzmms.net.nz/pxtsend MMS Proxy: 172.30.38.3:8080 MMS Max Message Size: 1048576 MMS UA Prof URL: http://www.apple.com/mms/uaprof.rdf

Press the Home button to save the APN and exit to the main screen.
Restart the iPhone.