I have recently had some missed calls on my mobile phone, the number showing on my mobile is +442. I live in the UK, is this someone dialling my phone from abroad. There is no other number showing just this code.

I don't answer calls where I don't recognize the number. Usually it is some person soliciting something that I don't want or need. Just don't answer the call if you don't recognize the number!!

Could be a message from your cell provider. When I leave the country I get an automatic text message from +5000.