I get that buy what I'm saying is that maybe you need to call AT&T and tell them you have an LTE iPhone... You might only be provisioned for a 3G HSPA iPhone plan.
I called them and yeah they told me to head to a store and get the sim replaced, the funny thing is I did a test without LTE on and got faster speeds , o and yeah I went to AT&T in the first place they should know the plan
Update: Ok called them again and was explaining them that my HSPA+ speeds were faster than my LTE and they said that because my phone was unlocked, yes purchased unlocked from Apple and it says on their website it supports their bands with AT&T LTE and is not working for some reason, any ideas? It sounds fishy that HSPA+ is reaching over 9mbps and LTE up to 3.5mbps during non busy hours, and what bothers me is that the employee says is my phone and I need to change it to a lock one from AT&T, and that I have to go to Apple to get it change
Update 2: contacted Apple and they told me the phone had nothing to do with it since its compatible with LTE radio for AT&T, that it had to do with them. I am going to change my sim and see if it works if it doesn't ill switch to a 4S