Optus Internet Settings for iPhone iPad

Optus 5G 4G LTE Internet and MMS APN Settings for iPhone 16, iPhone 15 Pro, iPhone 15, iPhone 15 Pro, iPhone 14 Pro, iPhone 13 Pro, iPhone 13, Pro Max, iPhone SE, iOS 17, iOS 18, iPad Mini, Air, Pro, Australia.

Go to Settings -> Cellular Data 
Tap Cellular Data to enable data
Tap APN Settings- >and Enter the following details

Cellular Data:
APN :  yesinternet
Username: Blank
Password: Blank
LTE Setup(Optional):
APN: Blank
Username: Blank
Password: Blank
MMS:
APN: MMS
Username: Blank
Password: Blank
MMSC: http://mmsc.optus.com.au:8002/
MMS Proxy: 61.88.190.10:8070
MMS Message Size: 524288
MMS UA Prof URL: blank