How to open APN settings on Samsung Galaxy S25 — O2 APN Settings Samsung Galaxy S25
| 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 |
Access Point Name (APN) is the setting that lets a handset reach O2's network for data, picture messaging and tethering. Get it wrong and the SIM registers but nothing loads.
Below are the O2 APN values for Android and iPhone, covering APN name, username, password, MMSC, MMS proxy and port. A 'connected but no internet' state usually points straight at the APN.
Entering O2 APN values on Samsung Galaxy S25 — O2 APN Settings Samsung Galaxy S25
Android 10 and up: Settings → Network & Internet (Connections on Samsung) → Mobile Network → Access Point Names. Add with the plus icon, or open the O2 entry to edit.
Galaxy handsets keep it under Settings → Connections → Mobile Networks → Access Point Names, while Xiaomi/Redmi use Settings → SIM cards & Mobile Networks → Access Point Names.
Troubleshooting checklist
Android's APN screen for O2, and the values it needs
APN settings greyed out on Samsung Galaxy S25 (O2)
On an iPhone running iOS 16+, look under Settings → Mobile Data → Mobile Data Network. Its absence usually means O2 pushes the APN automatically. Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings restores O2's defaults.
Newer iPhones running O2's carrier bundle sometimes grey out the APN field completely. If so, contact O2 support to update your carrier settings profile.
Troubleshooting checklist
The iPhone path to O2's APN settings, and what greyed fields mean
Testing your O2 connection after saving APN (O2 APN Settings Samsung Galaxy S25)
Populate the APN screen using the O2 values shown, ignoring anything absent. Save, restart, then choose the profile.
Troubleshooting checklist
O2's APN screen on Android and the values required
Troubleshooting O2 APN issues (Samsung Galaxy S25)
Still broken after entering O2's APN? Try these next, in order:
1. Start with an aeroplane mode toggle: ten seconds on, then off, which makes the phone reconnect to O2 and re-register the APN.
2. Do a full reboot, which clears transient faults and gets the new O2 values applied.
3. Recreate the APN from scratch. Removing and retyping it rules out a stray character in the O2 name or MMSC value.
4. A complete network reset works here: Settings → General Management → Reset → Reset Network Settings on Android, Settings → General → Reset → Reset Network Settings on iPhone. Wi-Fi passwords and Bluetooth pairings clear; O2 defaults return.
5. Verify the account itself — activation status, account standing and data allowance can be checked via the O2 hub or by calling customer services.
Troubleshooting checklist
The majority of O2 users are reconnected by step two
• The MMS Proxy field is an IP address only — no http:// prefix
• APN Type must contain mms (e.g.
default,supl,mms)• On Android, save then select the profile before testing
APN settings for MMS on O2 (Samsung Galaxy S25)
Within O2's APN profile, MMS has its own fields for MMSC, proxy and port. If picture messages won't move, those are the first things to verify. A handful of Android devices need a separate MMS APN entirely.
MMS setup checklist
O2's MMSC address only works with http:// — swap in https:// by mistake and picture messages stop dead
Frequently Asked Questions About O2 APN Settings Samsung Galaxy S25
Will changing APN settings delete anything?
No. Contacts, messages and apps are untouched — the APN only controls the O2 data and MMS connection, and defaults can be restored whenever.
Do I need to enter APN settings on an eSIM?
An O2 eSIM profile usually arrives with correct APN settings already. If data still won't work, entering the values by hand via the steps above may be needed.
Why is my O2 APN greyed out?
A locked APN field is common on some O2 devices and SIM types. Android: Settings → Network & Internet → Mobile Network may offer a reset-APNs option. iPhone: the carrier bundle governs it, so request an update from O2.