For Android just Go to Settings > Connections > Mobile Networks > Access Point or just simply search Access Point Name in Settings.
After that do the changes that are in this website to get AT&T 4G LTE Apn Settings
Table of Contents
AT&T 4G LTE Apn Settings for Android
| Apn Settings Name | Apn Internet Settings |
| Name | ATT Phone |
| Apn | NXTGENPHONE |
| Proxy | not set |
| Port | not set |
| Username | not set |
| Password | not set |
| Server | not set |
| MMSC | http://mmsc.mobile.att.net |
| MMS proxy | proxy.mobile.att.net |
| MMS port | 80 |
| MCC | 310 |
| MNC | 410 |
| Authentication Type | not set |
| Apn type | default,mms,supl,hipri |
| Apn protocol | Ipv4 |
| Apn roaming type | Ipv4 |
| Enable/disable apn | APN enabled |
| Bearer | Unspecified |
| MVNO type | none |
| MVNO value | not set |
Check This: Best ASTAC 4G APN Settings For Android and iPhone
AT&T 4G LTE Apn Settings for iPhone IOS
For iPhone just Go to Settings > Cellular > Cellular Data Options > Cellular Network
Cellular Data:
| Cellular APN Name | Cellular APN Settings |
| APN | NXTGENPHONE (or) phone |
| Username | Blank |
| Password | Blank |
LTE Setup (Optional):
| LTE APN Name | LTE APN Settings |
| APN | Blank |
| Username | Blank |
| Password | Blank |
MMS Data:
| MMS APN Name | MMS APN Settings |
| APN | NXTGENPHONE (or) phone |
| Username | blank |
| Password | blank |
| MMSC | http://mmsc.mobile.att.net |
| MMS Proxy | proxy.mobile.att.net |
| MMS Message Size | 1048576 |
| MMS UA Prof URL | blank |
If you are having an issue installing any Apn Settings do let us know in the comments below. Thanks