Chosen Solution
I have an iPhone X that can accept and make calls, can see the cell network, and log into the WiFi network, but cannot connect online with neither WiFi nor cell data. If I set the phone as a hotspot, the devices that connects to it can use the data online. Somehow, the phone just won’t connect. I’ve made sure the antenna is secure. I’ve reset all network settings. Hard reset. I’m not sure what this might be.
This problem usually occurs on the X’s after a drop. There are two parts of the logic board that are sandwiched together. The bottom board which has all the RF components communicates with the top board through solder pads. When it suffers a drop it can cause cracked solder balls which become oxidised. If you have checked the antennas I think you will need to separate the boards and re-ball the pads.
This worked for me. If you are connected to a wifi network, you are using the wifi. Are you stating that your cellular data only works when it’s enabled but not connected to a wifi network? Do you see the 4GLTE icon at the top of your screen? Check Settings>Wirleless&networks and ensure the state of the cellular network is enabled. If it is and the cellular data is not working you can try to reset the network information by opening up your dialer and entering ##72786# and tapping yes. This will take you thru the activation steps once more and you should have your cellular data working once more.
