If you are experiencing issues with roaming, check that:
Data roaming is enabled on your handset. You can turn your data roaming on or off in your phone's Settings. Please note: when data roaming is turned on, you may be charged for data use while not using your phone - e.g. if your phone automatically downloads new emails, apps etc.
You are dialling the correct number for that particular country i.e. you are including the international country code before the number e.g. 0044 for the UK, 0049 for Germany etc.
Your device is compatible for use in that region. For example, if you were roaming in the US you would need a Tri-Band Support device.
You have credit on your phone (prepay customers only).
Your account has been set up to allow you to roam internationally, and you are connected to one of our preferred roaming partners. To check this, chat with a member of our customer care team.
For more info on roaming, including roaming rates and FAQs, visit three.ie/roaming.