Both my wife and I have virgin mobiles with international roaming switched on. When my wife and I try to text her mum in Czech she doesn't receive them. Her mum can call/text both of us in the UK to our Virgin mobiles and we can call her, but if we both try and reply or send her a text it doesn't go through. We don't get a error message. We are able to call/text other family members in Czech. The problem appears to relate to one Czech mobile number only. We have cleared both out uk phones and manually typed in the Czech mobile number using the "0042" or "+42" prefix with no change. I've even used my work O2 mobile to send a text to the mother in law and it works. Has anyone else come across this and how did they fix it.