Step 1: To change the IPv network on your phone, tap on the “Settings” button on your phone. Then tap on “Connections” and you’ll see a screen as shown below.
Step 2: Scroll down the page, and look for “Wireless & networks (or More Networks). Once found, tap on it until you see a screen as shown below. Then tap on “Mobile Networks”
Step 3: When you screen like below, tap on “Access Point Names”
Step 4: When you see the screen below, tap on the current network that you are assigned to.
Step 5:Scroll down until you see “APN Protcol” and tap on it.
Step 6: Now, Select IPv4/IPv6 APN Protocol
Step 7: Finally, when you are done editing, you can save the APN details by clicking on Menu and selecting Save.