MMS on AT&T

[PepperdotNet]

I discovered today that multimedia content, i.e. pictures, weren't downloading in messages.

I found the instructions at AT&T regarding unlocked phones.

Create and enable an MMS APN in Settings > Network and Wireless > Cellular & SIM > SIM 1 settings.

Profile name: [whatever you like]
APN: phone
Username, password: [blank]
Type of sign-in info: None
IP type: IPv4v6
Proxy server: proxy.mobile.att.net
Proxy port: 80
MMSC (URL): http://mmsc.mobile.att.net
MMSC port: [blank]
Maximum MMS size (KB): 600
Apply and save.

Reference: https://forums.windowscentral.com/e...2FKB424489%3Fsource%3Dredirect&token=XEKKJANE

 

[nokia4life]

mine did not need any manual config all MMS come in and I can send out with no issues by simply putting my nano sim in that originally came with my iPhone 6 plus which I have used in my nexus 6p and blackberry priv , and now this with no issues. Do we know why some folks require manual vs auto settings being pulled down from the sim and network?

 

[PepperdotNet]

It might be because I waited until I had everything setup, backup restored and verified it was working well, before I moved the sim card from my old phone.

 

[PepperdotNet]

And.. apparently it worked exactly once. I've got outbound texts with picture and video attachments that can't send, my wife has an inbound that won't download. This is getting frustrating.

 

[elindalyne]

I had a similar issue with TMobile when I got the XL.... I ended up having to remove the APN settings and it just worked. Try removing the MMS APN and see if that fixes things.

 

[Bartdog]

Btw, ATT tech support has ZERO interest getting this to work. I don't know the unlocked phone paradigm will ever catch on in the US if this is the kind of crap hoops we have to jump through.

[edit... if you are not on an ATT branded phone, they do not guarantee you will have a data connection AT ALL.]

 

[Laura Knotek]

I wonder if it is related to the manufacturer of the phone, rather than anything else. I switched from an AT&T branded 2013 Moto X to an unbranded Moto X Pure Edition and didn't have to do anything with APNs. I simply swapped the SIM and everything worked.

 

[PepperdotNet]

...and today it's fixed by deleting the APN I created yesterday. Wonder if it will break again tomorrow.

My current speculation is that every time ATT decides to sell a particular hardware, they load their system with the entire IMEI range for that model. That would explain why for example an unbranded RM-877 has no issues but an RM-1116 does, ATT has no idea yet what a RM-1116 is.

 

[occamsmonkey]

I had no problem bumping the message size up to 2048. That's the default for iPhone, so the network can handle it. But ultimately, spoofing a contract IMEI was the magic wand that fixed everything for me.