How to open APN settings on Samsung Galaxy S25 — O2 APN Settings Samsung Galaxy S25 — Quick Guide
Publishing order: 453 • Cluster 40: Device and Network SEO
Getting the correct O2 APN Settings Samsung Galaxy S25 | UK Mobile Guide setup can improve mobile data speed, MMS messaging, and network stability on your device.
Use this if an O2 phone isn't behaving — setup, signal and data issues all covered.
No signal, slow data, hotspot failures, a blocked O2 SIM, roaming that won't register or a bad APN: work through the basics first.
A reboot usually re-establishes O2's connection; give it about 30 seconds to settle.
Confirm the O2 SIM is active and cellular data/roaming are switched on wherever the plan allows it.
Double-check the O2 APN profile is still present and saved correctly under mobile internet settings.
Troubleshooting checklist
These are ordered quickest-first, so start at the top
Entering O2 APN values on Samsung Galaxy S25 — O2 APN Settings Samsung Galaxy S25 — Quick Guide
| 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 |
Open the phone's Mobile Network or Cellular Data menu and check the O2 APN sitting there. After saving, restart and test data, MMS and hotspot sharing if that's part of your plan.