Hi, Same issue with iphone XR under 14.0.1 Cellular data not working at all, or working 1 second every 5min. Impossible to use the phone.  Checked with another SIM card, but I have the same problem. After multiple restorations/network reset, nothing change. Impossible to get back iOS13 which was working perfectly... waiting for the next update.

Hi, For me, after 1 month without cell data, the problem disappeared yesterday morning, by itself... I changed nothing, and have no idea how it was solved. I just left the phone for the night, without reboot, restore, nothing, and at morning it was working perfectly. The only new thinks I did one day before, is to write * #06#* on my iPhone to get some informations, because I was on the way to change it for a new one using my guarantee. But I don’t think it changes something. Today i installed iOS14.1, the problem don’t comes back. So maybe it’s a problem of compatibility between the internet provider and now it’s solved. I did also a lot of airplane mode on/off, to avoid to use the battery because of the « searching ... », maybe at one moment it established a correct connection ? Has someone experienced the same ? I am gonna continue to analyse my phone, in case of the problem come back again.