Please help!! Hello all, I am fairly new to the android world, but am happy to be a part of it now. I have a Galaxy S3 phone and I have been experiencing some intermittent problems making a call from my contacts list or from my favorites list. I open my phone contacts and choose to call, for example, "my wife". A white box appears with the words "Contact not registered on network", I try again and again, same message. I try another contact, same message. I restart my phone, good for a few days to a week or so. Then it happens again. I called Samsung tech support, they don't seem to be any help but do like to hand out Ref. numbers and then leave me hanging on my own. I reset my phone back to factory defaults (as per tech support) and a week later I'm back to intermittent errors again. Any help would be greatly appreciated. Thanks.