the last 2 days was a roll of the dice to get a ATT online rep and store to do exactly what i needed to get it good HSPA+ with ATT. There's a huge XDA forum and a AndroidCentral forum posts about some of the pains.
From experience:
Got a new new, free MicroSim from ATT
- default everything, everything worked but i noticed slower data speeds from my Motorola Atrix 2
- SpeedTest app was picking servers in the mid-west, i'm in the SF Bay Area. Terrible ping and download test would time out
- noticed data was bouncing between HSPA:10 when idle and HSPA:15 with data transmitting - which is correct for 4G but again speeds were slow but i couldn't prove it without SpeedTest. Ended up trying out dslreports.com webpage
Browsed through XDA/Android forums and thought i'd give a new APN a shot, what' to lose.
- new APN, could run SpeedTest with the correct bay area server, speeds were slow but since i was at work, no way to really tell. Webpages or anything access the internet was lagging, like a noticeable pause before any activity kicked in. Went back to default APN.
Went to the ATT Store and try to get them to provision my data to 4G unlimited, even brought in my old Atrix 2 in case they needed the IMEI. After some battle and escalation not much they could do, the guy tried to get me into an unlimited LTE data, even if LTE wasn't present in the phone, it'd drop me to HSPA+ vs 3G on my provision data. He suggested i contact online care to add LTE.
Just right now .. i contacted online care and asked them to add a SOCK Code for LTE to my data, so i can access .. they paused and since my phone isn't LTE, they couldn't and told me the best they could is a "unlimited data for 4G" - that's the MONEY MAKER!
Went back into a XDA and copied down the APN for 4G/HSPA+ settings and it's rocking out .. well as much as ATT 4G on the Bay Area.
Low Ping, Local servers, hit 6 Mbps on SpeedTest.
Test against friend's ATT 4S and similar speeds.
Thank goodness!!