APN & Cellphone Setup

H2O Wireless (AT&T) APN settings for iPhone & Android

If you switched to H2O Wireless and data, picture messages (MMS) or hotspot stopped working, your phone is probably still using your old carrier's APN. Enter the H2O Wireless settings below exactly as shown, save, restart — then test with Wi-Fi off.

📱 iPhone: Settings → Cellular → Cellular Data Network🤖 Android: Settings → Network → Mobile Network → APN → + New🔄 Always restart after saving

H2O Wireless (AT&T)

On iPhone, H2O's settings load automatically when the SIM is inserted and cannot be edited — reset network settings instead. Android values from H2O's SIM setup page; type the APN in capitals.

APN NameH2O

APNRESELLER

MMSChttps://mmsc.mobile.att.net

MMS Proxyproxy.mobile.att.net

MMS Port80

MCC310

MNC410 (280 if your SIM number starts with 8901280)

AuthenticationNone

APN ProtocolIPv4

APN Typedefault,mms,supl

Delete any old APNs from your previous carrier (keep only this one selected).
Save → select the new APN → toggle Airplane Mode for 10 seconds.
Test: turn Wi-Fi OFF, load a page, send a picture message, test hotspot.

Troubleshooting H2O Wireless

H2O-specific check: first restore the APN list to default on Android and restart — enter the values above only if data still fails. The most common mistake is a lowercase APN: it must be RESELLER in capitals. H2O's page is a few years old; if these values do not work, H2O support can confirm the current ones for your SIM.

Still deciding? Compare plans on the same towers in the plan finder, or read the switching guides.

Wrong carrier? See APN settings for all carriers →