– International calls are used to call from Belgium to another country.
– The term “Roaming” is used to make and receive calls from abroad.

You can call and send SMS messages from Belgium to all countries.
For an overview of countries and prices, please visit https://undo.be/tariffs/roaming.
Do not forget to add the prefix of the country of your correspondent preceded by the sign + or 00 and without the first 0 of the number. 

For example: you want to call the number 0402811215 in the Netherlands. You must dial +31402811215 or 0031402811215.

You can call and send SMS messages from abroad to all other countries.
For an overview of countries and prices, please visit https://undo.be/tariffs/roaming.
To call someone from abroad, you must add the + or 00 sign in front of the country prefix. Do not forget to remove the first 0 from the phone number. For example: you want to reach the Belgian number 0487030405 from abroad. You must dial the following number: +32487030405 or 0032487030405.

– When you are abroad, your handset is automatically connected to a local operator (the name of the local operator appears on the screen of your handset). If you can not call, send an SMS or surf with this operator, go to the settings of your handset and manually select another operator with whom you try.
– Just try restarting your mobile.
– To call someone from abroad, add the sign + or 00 in front of the country prefix. Do not forget to remove the first 0 from the phone number. For example: you want to reach the Belgian number 0487030405 from abroad. You must dial the following number: +32487030405 or 0032487030405.