Helpful Links

Mobile Data Not Working.


Mobile Data Not Working.

Hello All,


I have an issue. Recently I went on vacation (outside US) and I was using a local sim card there. After I came back to the US and put my AT&T sim card back in, I am facing an issue with my mobile data. Its not working anymore. I am on the $60 plan. I called up 611, and tech support asked me to reset the phone. Sounds a bit extreme, for something like this. Any suggestions on this would be helpful.

Message 1 of 6

Re: Mobile Data Not Working.

Hello muforlife,

Have you ensure that your AP settings are correct, and active?
Message 2 of 6
ACE - Professor

Re: Mobile Data Not Working.

Which make and model of phone is it??
While you use a local Sim card,do you download / accept any SMS from them ??
In some country, when you use their "Local" Sim card,they will change your setting by doing the above,
and mass up your APN setting.

You just need to switch back your APN in your phone.

*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.
Message 3 of 6

Re: Mobile Data Not Working.

Well it turns out the APN settings was incorrect. There are so many different APN's when you google, its hard to know which one is the correct. 


Thanks All! 

Message 4 of 6

Re: Mobile Data Not Working.

My Phone is Samsung Galaxy S4 I9500, unlocked.
Message 5 of 6

Re: Mobile Data Not Working.

I believe these are the APN Settings.


NAME: ATT Phone 

APN: phone

Proxy: (not set)

Port: (not set)

Username: (not set)

Password: (not set)

Server: (not set)


MMS Proxy:

MMS port: 80

MCC: 310

MNC: 410

Authentication Type: none

APN type: default,mms,supl,hipri,fota

APN protocol: IPv4

Bearer: Unspecified

Message 6 of 6
Share this topic

Find out how to track your iPhone's delivery!

Have questions about International Plans? Get the answers on Wed. 10/25 at Hello World: International Plans, from 1-4pm ET / 10am-1pm PT!

Let us help you upgrade and activate your device!

Additional Support