Roaming, unable to make calls or send texts (even basic word only ones)
In Canada (received text on arrival 'welcome to USA!' !!). Unable to make calls, calls say 'call ended' after approx 2 seconds, don't connect (roaming on, int calls baring off). Can receive texts, but cannot send (even simple text only ones), message displayed is 'failed, review message and try again'. As far as I can see, APN setup correctly. Anyone help at all ? Worked ok previously, only changes in last 6 months or so is an upgraded SIM sent out (had to swap as old one about to stop working) and switch from paygo to monthly). Samsung s7 phone, software latest version.