Hi, my cousin is visiting France and is using a French SIM. I have received SMS messages from him, but I can't reply. The displayed number shows the correct +33 prefix, but I can't send SMS messages to it despite repeated attempts. I can only assume the reason is that I'm trying to send to a number outside the UK, as I can still send SMS to UK numbers without problems. Do I need to do anything with my phone or O2 account to enable SMS to international numbers?
