This is the Official ATT LG G5 H820 User manual in English provided from the manufacture.
Those who are interested in this LG G5 can download the G5 user guide from below link:
Download AT & T LG G5 H820 User Guide
Language: English
File: PDF
Download: LG-H820_ATT_Eng_UG_D03_160316-1.pdf
The ATT LG G5 H820 user guide in Spanish is also available for download via this link:
http://www.lg.com/us/support/products/documents/LG-H820_ATT_SPA_UG_D04_160316.pdf
If you need to contact LG USA Official Support team, visit this link.,
You can also email LG official Support or talk to LG Customer Support Team, if you experience any issues with YOUR LG G5 smart phone.