Correct O2 APN settings for all UK devices — internet, MMS, 5G and data values. Full setup guide for Android and iPhone, verified 2026.
Does O2 support international roaming?
Yes, O2 supports international roaming in most countries worldwide. When you travel abroad with your O2 SIM, your phone connects to a partner network in that country. Depending on your plan, data roaming may be included in your monthly allowance or charged at an additional rate per megabyte or day.
Always check your O2 plan details before travelling. Roaming charges vary significantly between destinations and plan types. The O2 APN hub has a full list of roaming destinations and rates.
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Post-Brexit: EU roaming charges may apply on UK networks
Since leaving the EU, UK networks can legally charge for EU roaming. Always check your plan's roaming terms before travelling. Some plans include free EU roaming; others charge per MB at high rates. Turn on data roaming only after confirming your tariff covers it — unexpected bills can be very large.
How to enable roaming on O2
On Android: Go to Settings → Network & Internet → Mobile Network and enable Data Roaming. On Samsung, the path is Settings → Connections → Mobile Networks → Data Roaming.
On iPhone: Go to Settings → Mobile Data → Mobile Data Options and toggle Data Roaming on.
Note: Enabling data roaming does not turn on internet automatically — your O2 plan must include roaming, or you may be charged pay-as-you-go roaming rates.
Enable data roaming before travelling — and always check your tariff first
O2 roaming APN settings
Setting
Value
APN Name
mobile.o2.co.uk
Username
vertigo
Password
password
MMSC
http://mmsc.mms.o2.co.uk:8002
MMS Proxy
82.132.254.1
MMS Port
8080
Authentication Type
PAP
APN Type
default,supl,mms
In most cases your phone uses the same APN settings for roaming as it does in the UK. If data does not work abroad, try manually selecting the local partner network: go to Settings → Mobile Network → Network Operators, choose Search manually, and select the local carrier. Then check that your APN settings still match the standard O2 configuration.
Enable data roaming before travelling — and always check your tariff first
!
Post-Brexit: EU roaming charges may apply on UK networks
Since leaving the EU, UK networks can legally charge for EU roaming. Always check your plan's roaming terms before travelling. Some plans include free EU roaming; others charge per MB at high rates. Turn on data roaming only after confirming your tariff covers it — unexpected bills can be very large.
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Fastest way to apply new APN settings
After saving, turn aeroplane mode ON for 10 seconds, then turn it OFF. This forces an immediate network re-registration — quicker than a full restart and equally effective.
Troubleshooting O2 roaming problems
No data abroad: Confirm data roaming is enabled in your phone settings. Check your O2 plan includes the destination country. Try manually selecting a local partner network. Toggle aeroplane mode off and on.
Roaming charges unexpectedly high: Set a data roaming limit in your phone settings. Some apps use background data even when you are not actively browsing. Disable background app refresh when abroad.
Calls not connecting abroad: Make sure Voice Roaming is also enabled if separate from data roaming. Some countries require a specific dialling prefix — check the O2 roaming guide for your destination.
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Follow these steps in order — most issues are resolved by step 1 or 2
Best practice for roaming on O2
Download offline maps before you leave. Connect to hotel or café Wi-Fi for heavy data use. Use the O2 app to monitor your roaming usage. Consider purchasing a O2 travel bolt-on or daily data pass for your destination to avoid unexpected charges.
To enable O2 roaming, go to Settings → Mobile Data → Mobile Data Options → Data Roaming and toggle it on. You may also need to add a roaming bolt-on or international add-on to your O2 plan.
Does O2 charge for EU roaming?
Roaming charges on O2 depend on your plan. Many O2 plans include free EU roaming, but some may charge a daily roaming fee. Check your O2 plan details before travelling.
What is the O2 roaming APN?
When roaming internationally, your phone should automatically use the local network's APN. If data does not work abroad, check that Data Roaming is enabled and your O2 APN is set correctly.
Why is my O2 data not working abroad?
O2 data may not work abroad if data roaming is disabled, your plan does not include international data, or the APN settings need updating. Follow the steps in this guide to fix O2 roaming.
Which countries are included in O2 roaming?
O2 roaming availability and charges vary by destination. EU/EEA countries are usually included in UK plans. For full roaming details, check the O2 website or your plan terms.
