I can't seem to get a competent tech on the phone to help me with this 4G plan. Anyone else have any luck? I'm still on my iphone 4s plan.
This is generally the hardest part of dealing with a US mobile provider, most employees (at&t employees in your case) mindset is dealing with branded and sold handsets vs. unlocked/unbranded handsets.
My best advice would be to check and ensure your APN settings are correct with regards to the type of plan they have you on (in your case the iPhone plan)
As I have never owned an iPhone, I am not 100% positive of the correct APN settings, but if memory serves the iPhone was the first handset to use the "phone" APN and thus might be something to try before dealing with at&t which can be frustrating.
Potential APN
(Settings - > Wireless & Networks - > More - Mobile Networks - > Access Point Names)
If under whatever name is in larger text the word "phone" appears than unfortunately you are going to have to deal with at&t to have the switch you to the correct plan.
However, if you see the words, "wap.cingular" than simply changing the APN might solve the issue for you.
(Menu - > New APN)
Name: Whatever you like, I used at&t HSPA+
APN: Phone
Proxy: leave blank
Username: leave blank
Password : leave blank
Server: leave blank
MMSC:
http://mmsc.mobile.att.net
MMSC proxy: proxy.mobole.att.net
MMS port: 80
MCC: DO NOT CHANGE
MNC: DO NOT CHANGE
Authentication type: leave blank
APN type: default,supl,mms,hipri
APN protocol: DO NOT CHANGE
APN roaming protocol: DO NOT CHANGE
Bearer: DO NOT CHANGE
Hope it helps,
Dan