Roaming Issues

EDIT : Just a thought, you have toggled on data roaming within your phone’s settings ?

Your phone would have been too high up during flight to connect to a network.

I once didn’t switch my phone to airplane mode during a flight. It hadn’t connected to a network by the time I discovered this half way through a flight. 

So, reading your latest post above, you have SIMs from both Smarty and Three in your phone ? And neither connect when your abroad ? Three is Smarty’s parent company of course, so Smarty runs on Three. 

Is your phone a personally owned phone, or a company phone ? If it’s a company owned phone, is there any software on it that may restrict connectivity abroad ? 

If my assumption from your post above is that you also have a three SIM in your phone is correct,  may be worth popping into a three store or even booking a “genius bar” visit to an Apple Store, to see if they can spot any issues with your phone. If your phone works fine in the UK, but doesn’t offer mobile data connectivity abroad, despite showing it’s connected to a network, and there isn’t a VPN or other software blocking data connectivity overseas, then it’s probably best to get the phone checked out. Not sure if MSF has any other ideas.