Sounds like your mobile data doesn't work, which is why you can only get the internet at home (you are connected to WiFi) @Crisbee .
Check if your APN settings are correct - here is a link to the correct ones.
If those are correct then we need some more information - are you on PAYG or pay monthly?
Are your bills up to date / have you got an active bundle / sufficient credit?
Please note, this is not customer services and we cannot access your account. Do not publish personal details (email, phone number, bank account).
Link to our guide on how to contact them can be found here
Track usage, upgrade and get support with the My O2 appDownload My O2