Blu life pure AT&T settings voice, MMS and Data
I'm one of the people hanging onto an AT&T unlimited data plan with white knuckles and I got tired of the apple structure so I got my hands on an unlocked Blu Life Pure hoping to try out android for a while. So I swapped the sim out of my iPhone 5s and luckily most of the APN info was already there so voice worked right out of the box and I could send texts but I couldn't receive any. I set up the legacy cingular settings and could send and receive texts but when I left the safety of my wifi I had no data. The fix was incredibly easy. Here are the APN settings that transferred over.
APN Type: default,mms,supl
MMS proxy: proxyDOTmobileDOTattDOTnet
MMS port: 80
AUTH type: not set
APN Protocol: IPv4
APN roaping protocol: IPV4
APN enabled: Yes
What fixed it for me was making a second APN item with these same settings but I changed the AUTH type specifically to "NONE" and that did it.
Hope that helps.