So my S4 arrived today and I took my giffgaff sim from my old iPhone 2g and stuck it in. When i try to make calls i get "Not Registered on Network".
Internet is working (its NOT using wifi). I followed some other posts about setting up the APN manually and I can browse, look at youtube etc.
I can see signal bars.
I can see an H icon with up/down arrows underneath it
When i goto into Settings -> Network Operators and Select "O2 - UK" it says "Registered On Network"
When i try and make a call i get "Not registered on Network"
Also i noticed theres a small pulldown screen when i touch the network icons at the top and it says "Emergancy Calls Only"
Dont know what else to do, please help !