Originally Posted by
LtKernelPanic
Made it to London a couple days ago and got my Orange Holiday package installed fine once I got to the hotel. I followed the instructions a few posts up and it didn't work. In fact I had written a post explaining what I had done and what my settings were when I noticed one setting. Under General -> Cellular-> Cellular Data, which I have set to use my travel SIM, there's a setting "Allow Cellular Data Switching" that was disabled. Enabling that and temporarily turning off wi-fi while in the hotel, my AT&T line went from no service to "vodafoneUK using cellular data." Before that when I was on wi-fi the AT&T line would say AT&T Wi-Fi otherwise it said no service. Oddly the voice service is using EE and the data is from vodafoneUK. Even without the wifi calling working texts still arrived fine from both iPhone and Android phones. FWIW for anyone reading this in the future I'm using an iPhone 13 Pro Max that's running the latest iOS which as of today is 14.6.1.
I know someone who went to Europe but could not get his US unlocked iPhone's data to work at all with the Orange SIM (or eSIM, I can't remember) that he bought before he left. It did not work the entire trip but phone/texting worked.
If I had to guess, I would think it has something to do with the APN not properly set.
According to this
https://orange.simoptions.com/faq/:
Example on the iPhone:
a) Open your iPhone and click on Settings > Mobile > Mobile Data Network (or Edge in early versions). b) Then fill in the fields as follows:
Orange:
- Access Point Name (or APN): orange
- User name: orange
- Password: orange