LG G3 Unlocked phone not able to use to cellular data

Hello I am using LG G3 Unlocked phone and my carrier is AT&T. I am able to connect to WiFi and everything is fine about it. But when I don't have WiFi accessible, the cellular data is not working. I made sure that the Cellular Data icon is turned on and the preferred network mode is set to already set to "GSM/WCDMA auto".  The other preffered network modes were 1. GSM/WCDMA/LTE auto, 2. WCDMA only, 3. GSM only. I can manually change and make it stay at WCDMA only. If I try to keep in the 1st option, it reverts backs to its original "GSM/WCDMA auto" status. The Access point names shows AT&T PTA and inside that it shows a preview of plenty other things like PORT, PROXY, USER NAME, PASSWORD and none of them can be edited. Please advice me on how I can use my cellular data. 

You are right Glimmerman76. I am not able to link up to the LTE thing in my phone. It is currently using preffered Network mode as GSM/WCDMA auto and I cant change it to GSM/WCDMA/LTE auto in the settings.  Could you please suggest me on how I can get the LTE in my phone? Do I need to update my phone details with my carrier or do I need to make any changes to the new APN that I have created? Please advise me on this. I appreaciate your help. Thanks,Hari

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