Trying to change apn for att Impulse 4G but cant find MMS_APN

You chould contact your cellular provider and ask them for it.

or you could try these:
Name: ATT
APN: wap.cingular
Proxy: <Leave in Blank>
Port: <Leave in Blank>
Username: [email protected]
Password: cingular1
Server: <Leave in Blank>
MMSC: http://mmsc.cingular.com
MMS proxy: wireless.cingular.com
MMS port: 80
MCC: 310
MNC: 410
Authentication type: <Leave in Blank>
APN type: default,supl,mms
APN Protocol: Leave it to the Default one

Taken from here:
https://apn-settings.com/us/att-apn-settings/

An Access Point Name (APN) is the name of a gateway between a GPRS, 3G or 4G mobile network and another computer network, frequently the public Internet. A mobile device making a data connection must be configured with an APN to present to the carrier.

For AT&T
Programming non AT devices with the correct APN and MMS data settings AT...

For Tmobile.
Mobile apn settings Step by Step Configuration

There are a few things to do that may fix your issue:

1. Delete text messages off of your phone (especially if you have hundreds of texts to one recipient)

2. Go to settings in your "messager" app and reset setting to default.

3. Make sure your APN settings are correct:
Go to "Settings"
Select "More networks"
Select "APN"
Edit your currently used apn...
Name: ATT
APN: wap.cingular
Proxy: none
Port: none
Username and password are blank
Server: none
Mmsc: http://mmsc.cingular.com
Mms proxy: wireless.cingular.com
Mms port: 80
Mcc: 310
Mnc: 410
Authentication type: none
APN type: default

Make sure your 4g is on and make sure that your data plan is for 4g

try this one

had the problem going through forums trying to find the settings that work for my phone but to no success but I finally figured it out and I'm posting it on here just in case some one else has my same problem.
I had to create two separate APN's one for internet and one for MMS. Settings are as follows:
Internet:
Name: Straight Talk Internet
APN: att.mvno
Proxy: proxy.mvno.tracfone.com
Port: 80
User Name: Not Set
Password: Not Set
Server: Not Set
MMSC: Not Set
MMS Proxy: Not Set
MMS Port: Not Set
MCC: 310
MNC: 410
Authentication Type: PAP or CHAP
APN Type: Internet
APN Protocol: IPv4
Bearer: Unspecified
MMS
Name: Straight Talk MMS
APN: att.mvno
Proxy: Not Set
Port: Not Set
User Name: Not Set
Password: Not Set
Server: Not Set
MMSC: http://mmsc.cingular.com
MMS Proxy: 66.209.11.33
MMS Port: 80
MCC: 310
MNC: 410
Authentication Type: PAP or CHAP
APN Type: Internet+MMS
APN Protocol: IPv4
Bearer: Unspecified
Do not forget to create two separate APN's!!!!!


goodluck

Straight Talk AT&T APN Name ATT 4G LTE APN tfdata Proxy proxy.mobile.att.net Port Username Password Server MMSC http://mmsc.mobile.att.net MMS Proxy proxy.mobile.att.net MMS Port MCC MNC Authentication Type PAP APN Type default,mms,supl,hipri APN Protocol IPv4

Make sure your APN settings match.
Name: Straight Talk
APN: tfdata
Port: 80
MMSC: http://mms-tf.net
MMS proxy: mms3.tracfone.com
MMS port: 80

Originally Posted by Geet [img src="http://cdn3.xda-developers.com/images/XDA2012/buttons/viewpost.png" border="0" alt="View Post" title="View Post">
APN Name. any
APN. wap.tracfone
proxy. blank
port. 8080
mmsc. http://mms.tracfone.com
mms proxy. blank
mms port. 8080
hope this works for u as well StraightTalkSIM DATA APN Settings TMobile

here you go i have my htc inspire 4g working perfect now it connects to the internet and sends mms fine

Name:T-Mobile US
APN:epc.tmobile.com
Proxy:216.155.165.050
Prot:8080
Username:none
Password:**** (i typed in 4 stars) :p
Server:* (i typed in 1 star)
MMSC:http://mms.msg.eng.t-mobile.com/mms/wapenc
MMS proxy:261.155.165.050
MMS Port:8080
MMS protocol: Wap 2.0
MCC:310
MNC:260
Authentication:NONE (Make sure you dont leave blank put NONE)
APN type:default,admin,dum,mms

enjoy

For the normal at&t apn settings, or also called at&t wap settings, these are the values you should use
Name: ATT
APN: wap.cingular
Proxy: <Leave in Blank>
Port: <Leave in Blank>
Username: [email protected]
Password: cingular1
Server: <Leave in Blank>
MMSC: http://mmsc.cingular.com
MMS proxy: wireless.cingular.com
MMS port: 80
MCC: 310
MNC: 410
Authentication type: <Leave in Blank>
APN type: default,supl,mms
APN Protocol: Leave it to the Default one

at&t apn settings 4Gdetails: If you have a 4G phone (e.g. iPhone 5, Galaxy S4, HTC one, etc) you should try using these at&t apn settings 4G. They run faster and more stable connections.
Name: ATT HSPA+
APN: phone
Proxy: <Leave in Blank>
Port: <Leave in Blank>
Username: <Leave in Blank>
Password: <Leave in Blank>
Server: <Leave in Blank>


MMSC: http://mmsc.mobile.att.net
MMS proxy: proxy.mobile.att.net
MMS port: 80
MCC: 310
MNC: 410
Authentication type: <Leave in Blank>
APN type: default,supl,mms,hipri
APN Protocol: Leave it to the Default one
Bearer: leave it to the Default one at apn settings Step by Step Configuration