When I’m travelling outside of the UK I have real trouble receiving calls. It started happening only on certain numbers, my phone would ring but when I answered the was just silence at the other end. Sometimes the callers wouldn’t even get the ring tone at their end even though my phone rang.
now it’s got worse. My phone will ring just once and then it will cut the caller off and I have to call them back. Contacted virgin who sent me a new SIM card but it made no difference..