Setup manually H2O Wireless APN Settings for your device. This is H2O Wireless Internet APN Settings which is updated. Here I share a complete guide and step by step process.

H2O APN Settings for Android

Configure H2O Wireless APN in your Android easily. Here I share an easy system for all the android device. Follow the instruction...

How to setup H2O APN Settings on Android?
In your Android mobile/Tab Go to Settings > More >Cellular/MObile Network > Access point Names > + ( to add)
Then fill up the below information...

Name: H2O Wireless Internet
APN: att.mvno
Proxy:
Port:
Username:
Password:
Server:
MMSC:
Multimedia message proxy:
Multimedia message port:
MCC: 310
MNC: 410
Authentication type:
APN type: default,supl
APN protocol: IPv4/IPv6
APN roaming protocol: IPv4
Bearer: Unspecified
H2O APN Settings for Android
H2O APN Settings for Android

Restart Android to apply new H2O Wireless Internet APN settings.

H2O APN Settings for iPhone

Here I share H2O Wireless apn information for your iPhone device. All the information and processes are essential. Fill up all the information correctly, otherwise, your internet does not work.

How to setup H2O APN Settings for iPhone or iPad?
In your iPhone mobile go to Settings> Cellular> Cellular Data Network> APN and fillup the below information.

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
H2O APN Settings for iPhone
H2O APN Settings for iPhone

H2O network frequencies 

3G - UMTS 850 MHz, UMTS 1900 MHz
4G -LTE Band 2 1900, LTE Band 4 1700/2100, LTE Band 5 850, LTE Band 17 700