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 by clicking here. 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.
Is your device compatible for use in that region? For example, if you were roaming in the US, you need a tri-band device.
Do you have credit on your phone? (This applies to Prepay customers only.)