Mine too.  All fine for about a year.  Then just started going silent.  Replaced sim and then had second phone sent out.  Same issue, calling and receiving calls practically impossible.  V little support from either carrier (o2) or samsung - who claim that it isn't a known fault.  A lot of these posts seem several months old - did any of those earlier posters get a resolution.   On O2 in the UK, pay monthly business account ... View more