O2

I am not sure if this is one for Samsung or O2 but any help appreciated. I have two email addresses btinternet (Default) and Outlook. I haven't had a problem for three years when it was set up but now I have discovered that my Outlook emails have not...

Last night, in the space of one hour I received 14 calls from a number beginning 870 (Arkansas I think) 870 was followed by a different number on each occasion and the phone rang for a few seconds before cutting off. I didn't answer any of the calls....

I have just tried to make a call and I am told "Not Registerd on Network" I have trawled the internet looking for an answer but some of the solutions are beyond my technical ability. In the end I just turned the phone (S7) right off and turned on aga...