If cellular data is not working on your iPhone, there are several ways to potentially resolve the issue.

Only the Apple Watch Series 3 and 4 (GPS + Cellular) models can use cellular data, provided they have been set up with a supported carrier.

As seamless as Apple makes it look, FaceTime isn't magic. Like every other video-conferencing app, it works by streaming video and audio between devices, which means the moment you're off Wi-Fi, it's ...