If you are experiencing issues with roaming, check that:
Data roaming is enabled on your device. You can turn your data roaming on or off in your phone's Settings.
To find out how to enable data roaming on your device, check out our Device Support. Simply choose your device to get started. (For example: choose iPhone 12, then go to Internet > How to enable data roaming. Follow the step-by-step guide)
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/+44 for the UK and so on.
Your device is compatible for use in that region. For example, if you were roaming in the US, you need a Tri-Band Support device.
You have credit on your phone (this applies to 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.