Below are the steps you must follow to configure the internet on an iPhone.
1. Access Settings (cogwheel icon).
2. Go to General -> Cellular -> and verify that Cellular Data is switched on and 3G or 4G is selected under Voice & Data.
3. If under Cellular Data you are able to access a sub-menu by selecting Cellular Data Network, check the setting is correct as per your new carrier:
If you are still having problems connecting to the internet, we recommend contacting your network provider for assistance as they know your internet configuration details. However, please do not hesitate to contact doctorSIM if you experiencing difficulties following the steps outlined above.