Germany should prove interesting as the 3G services have now closed down. Eventually that will boost 4G but not fully yet
With Virgin I always recommend the following
sim tool
For Android:
Select Apps from the Home Screen
Select SIM Toolkit Icon
Select Roaming
Select Select Mode
Select Manual
Select International-you are done, go back to Home Screen
To Switch back when in the UK:
Select Apps from screen
Select Virgin SIM Toolkit Icon
Select Roaming
Select Select Mode
Select Automatic and go back to Home Screen
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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