AT&T has a significant problem handling unlocked google play devices that can cause your bandwidth to be capped around 2-3mbps. The problem is that the IMEI of the device isn’t automatically detected in the system as a phone that needs a “Dataplan for 4G Smartphones” and instead is marked as “Dataplan for Smartphones”.

You’ll need to call up AT&T support explain this problem to the rep. They will assign a dummy guid from a device that their system registers to your account as a workaround to assign the correct data plan.

After this, if you set your APN information correct, you can get much higher speeds. If you’re phone won’t work with these settings, it’s on the wrong data plan.

APN Settings:

Name: AT&T US HSPA+ (This doesn’t matter)

APN: pta

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 (should be auto set to your country code)

MNC: 410 (should be auto set to your network code)

Authentication type: Not set

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

APN protocol: IPv4/IPv6

APN roaming protocol: IPv4/IPv6

Bearer: Unspecified

Make sure you click the overflow button and hit save. These settings will also theoretically work for LTE Band 4 which the phone also supports but AT&T doesn’t have many towers supporting it yet, so it’s untested.

Enjoy your better speeds!