1 ACCEPTED SOLUTION. If using an iPhone, change your data apn to "mobile.o2.co.uk". I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues. If using an iPhone, change your data apn to "mobile.o2.co.uk I have a Samsung s5 mini on pay monthly contract. Recently my mobile data has stopped working properly. Sometimes when I turn data off then back on it will work again for a while but then won't again. I have recently been abroad on holiday and turned my data off I don't know if this will have anythi Activating your O2 mobile data is straightforward as long as you have access to Wifi in the interim before your mobile data is switched on; Step 1. Insert your O2 sim into your device. Step 2. Go to the login page for O2. Step 3. Input your mobile number (this will be in the package that your SIM came in) Step 4. Select ‘Sign In’. What are Bolt Ons? When you're running low on minutes, texts or data, you can top up with a Bolt On, from as little as £3 a month. There are even Bolt Ons for calling abroad, or if you're going away yourself. If you're already with O2, you can manage your Bolt Ons in My O2. Otherwise you can add them once you've joined us. After this, you’re only responsible for paying up to £100 in unauthorised use beyond your allowance. As an added precaution, backup any personal data and media – photos, videos, documents and other info. – before your trip. Using your internet abroad can be expensive (if you're not careful). Guide How to Top Up (PAYG) Go to any O2 shop or anywhere you see the green top-up logo and ask for an O2 top-up. You can pay by cash or card. Then call 4444 free from your mobile, or 08456 062 277 from a landline, enter the number on your receipt and follow the instructions. Then reach out to O2 on Social media, links below this post, for help Manually search for another network. Reboot the phone. If still not working then contact O2 to remove the Roaming bar on your account. If you message O2 on Facebook ( Some things to try: * Make sure data roaming and mobile data is turned on in your phone's settings. * Manually search for another network * If you have an iPhone change your data APN to "mobile.o2.co.uk" * Try toggling Airplane mode on/off (it often helps k .

o2 data not working abroad