H2O Wireless USA 4G LTE 5G Internet and MMS Settings foriPhone 13 Pro, iPhone 13, iPhone 12 Pro, Pro Max, iPhone SE, iOS 15 iOS14 iPad Pro
H2O APN Settings for iPhone iPad
In your Apple iPhone go to Settings -> Cellular -> Cellular Data Network -> APN and enter the following details
Cellular Data:
APN: att.mvno
Username: Blank
Password: Blank
LTE Setup(Optional):
APN: Blank
Username: Blank
Password: Blank
MMS:
APN: att.mvno
Username: blank
Password: blank
MMSC: http://mmsc.cingular.com
MMS Proxy: proxy.mvno.H2OMobileweb.com
MMS Message Size: 1048576
MMS UA Prof URL: blank