Samsung Galaxy A3 will not register to network

[Anonymous]

I have a SIM that works on multiple devices barring a Galaxy A3 - purchased from o2. Another new SIM has the same issue. So (most of the time) I can see o2 Network when selecting a mobile network (auto select just seems to hang), but when I select o2, it displays 'Registering on O2-UK..', for a few mins then stops. I'm left with no service. I can get on Wi-fi, but cannot see a mobile network. I have set APN settings manually and as default O2, but still have no network (and therefore no mobile data too). 

Any suggestions?

[MI5 · Accepted solution]

Sounds like the phone is faulty so I'd take it back.

[Anonymous]

thanks! ergh, dealing with O2 store while hungover will be interesting! 

[MI5]

Good luck