1. Always dial numbers with the full international dialing code even if you are calling within a country (e.g. +44 7624 xxx xxx).
2. After dialing the number, there will be a slight pause, as the service rings you back to connect your call. Answer normally. Ignore any messages the phone may display during this process
NOTE: When using the US, UK or Mexico profile, the calls are call-through, not call-back. Only the Global profile (PIN 10000) uses call-back.