You can use Ringo while roaming as long as you use a local SIM of that country.
So, for instance, when you travel to the UK and get a local UK number during your visit there, all you need to do is add a new number to your existing Ringo account.
Alternatively, you also use the WiFi Roaming feature if its supported in the country to which you are traveling. Click here to check which countries support WiFi.
Note: If you use your existing number and not a local number, while you are abroad, to make a call using Ringo, roaming charges based on your carrier plan will apply.