Question: how to set up personal hotspot on iphone at&t?
Answer: Use your AT&T device as a mobile Wi-Fi hotspot to share your data connection with Wi-Fi-capable devices such as: other smartphones, tablets, netbooks, MP3 players, and more. ... 
Tap Cellular.
To turn on or off, tap the Personal Hotspot switch. ... 
To change the Personal Hotspot password, tap Wi-Fi Password.