Try this
For iOS:
Select Settings from the Home Screen
Select Phone Icon
Select SIM Applications
Select Roaming
Select Select mode
Select Manual
Select International and you are done, go back Home screen to retry
To change back when returning to the UK:
It is critical that you set the SIM roaming applet back to Automatic mode once in the Uf Settings > Mobile Data > Sim applications
Select SIM Applications
Select Roaming
Select Select mode
Select National - you are done, go back to Home screen
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