If you are getting a message such as 'incompatible sim', 'enter subsidy PIN' or 'enter network unlock code', then your phone needs to be unlocked.
Some mobile providers lock your phone so that you can only use one of their SIMs. But don’t worry, it’s easy to fix. If you are joining us from another network, simply call your old mobile provider and ask for your Network Unlock Code (NUC). Then you can slip your new SIM in your old phone and enjoy clearer calls right away.