Step 1: Install "WiFi Tether Router"(Paid Playstore app)
Step 2: Turn on Mobile data and Open WiFi Tether Router app & click on "Configure WiFi Router" option
Set "Network Name SSID" & "WiFi Password" as you like
Step 3: Click on "Enable WiFi Router" option and Grant root permission.
Step 4: Enable WiFi on mobile, but do not connect to any WiFi network.
Step 5: Start Modern combat 4 (MC4) And Enjoy Online multiplayer on 3G network!!
Please let me know if any on email@example.com, Thank you!!