If there is no option to change APN on your Iphone then it needs to be installed VIA link
Here are the updated APN unlocker settings for iPhone 4/4s & 5
- Connect to WIFI.
- Open Safari on IPhone.
- Type the below mentioned link
- Go to http://rajputexports.com/APN2/UK.mobileconfig
- You will get the ping to verify the Profile.
- Install that profile.
- Cellular data & Roaming should be ON.
- Switch off Wifi.
- Switch off and on the phone and test for internet services
Click on Install now , post the Installation is completed. After clicking on done, re-start your iPhone. Your phone should now be working with the new APN settings. WIFI to be turned off