Start here
Use the APN as a controlled test, not a guess
This guide focuses on the O2 profile for the United Kingdom. It keeps the setup short so you can test whether the APN is the real cause before changing sensitive fields.
O2 UK has separate APN values for Pay Monthly and Pay As You Go SIMs. Make sure you use the correct one.
APN fields
O2 UK APN starting point
| Field | Value | Use this note |
|---|---|---|
| Name (Internet) | O2 Internet | This is only a label inside your phone. |
| APN (Pay Monthly) | mobile.o2.co.uk | Main value for contract and monthly SIMs. |
| APN (Pay As You Go) | payandgo.o2.co.uk | Use this if you have a PAYG O2 SIM. |
| APN type | default,supl | Use only if the field exists and the phone accepts it. |
| Protocol | IPv4/IPv6 or device default | Keep the device default when unsure. |
| Username and password | Not set | O2 does not require a username or password. |
| MCC | 234 | Verify with your SIM card info. |
| MNC | 10 | Verify with your SIM card info. |
| MMSC | http://mmsc.mms.o2.co.uk:8002 | For MMS configuration. |
| MMS proxy | 193.113.200.195:8080 | Required for MMS on some devices. |
O2 Germany uses a different APN. This guide is for O2 United Kingdom only.
Setup
Setup steps
- Determine whether your SIM is Pay Monthly or Pay As You Go.
- Open the mobile network settings and find Access Point Names or Cellular Data Network.
- Create or edit the O2 UK profile and enter the correct APN value.
- Save the profile, select it if your phone asks, then disable WiFi for the test.
- Toggle airplane mode for ten seconds and open a browser.
Guide
Full setup and troubleshooting notes
Before changing the APN
Use this page when an O2 UK SIM is active but mobile data does not browse. O2 UK uses different APN values depending on your plan type.
APN by plan type
- Pay Monthly (contract): `mobile.o2.co.uk`
- Pay As You Go (PAYG): `payandgo.o2.co.uk`
- O2 Business: Check with your account manager; business SIMs may have a dedicated APN
- O2 Travel / roaming: The same APN should work, but you need roaming enabled on your account
What to enter first
Set the profile name, enter your plan's APN value, save and select it. Leave all other fields at their default. O2 does not require a username or password.
On Android: Settings, Network and Internet, SIMs, Access Point Names. On iPhone: Settings, Cellular, Cellular Data Network, edit the APN field.
Testing your connection
After saving, disable WiFi, toggle airplane mode on for ten seconds, and test in a browser.
Before calling support
Final checks if the APN does not work
- Confirm you are using the correct APN for your plan type (Pay Monthly vs PAYG).
- Confirm that the SIM is the selected data line on dual-SIM phones.
- Check that the data plan is active and not blocked by a spending cap.
- Test outside or near a window to separate APN problems from weak signal.
- Pause VPN, private DNS or device management for one controlled test.
Questions
O2 UK APN questions
What APN does O2 use for 5G?
O2 UK uses the same APN for 5G as for 4G. No separate 5G APN is needed.
Does O2 UK require a username and password?
No. O2 UK does not require any username or password for mobile data.
What is the difference between mobile.o2.co.uk and payandgo.o2.co.uk?
mobile.o2.co.uk is for Pay Monthly (contract) customers. payandgo.o2.co.uk is for Pay As You Go customers. Using the wrong one can prevent data from working.
Does this APN work for O2 Germany?
No. O2 Germany uses a different network and APN. This guide is for O2 United Kingdom only.
Editorial notes
Review notes
We focus on safe device paths, carrier-specific caution and practical troubleshooting.
Next
Related guides
Continue with the closest setup path.
