I have a 5G BT mobile plan with roam like home enabled. I'm currently abroad (in Switzerland) and I'm on the same Swiss network as I've always been when here with my old UK provider. My old provider would let me use 5G here but I don't even get the option on my phone to change between 5G/4G with BT. It appears as if I can't use 5G abroad.
Does BT allow you to use 5G abroad as well? I couldn't find any current information hence I'd be happy if someone could answer this. 🙂
There is another link you could look at but due to the context in which it has been written I'm not sure if it's applicable to your circumstances or if it applies only to countries where roaming is not available.
BT Mobile data roaming work in every country? | BT Help states "Roaming won't be initially available for your 5G plan, so if you use your 5G phone abroad, you might not get 5G data speeds. Your phone will still work, but could be using 4G, 3G or even 2G, depending on the network in the country you are in."
Phone Moto G 5G plus.
Cattier BT mobile
Location Donegal Ireland.
5G or 4G+ roaming.
Carrier(s) : EIR(roaming), Orange France (Roaming) and some (BT/EE /home non roaming) figures. Seems some 4G+ stats while roaming are better than 5G stats while roaming.