This should not affect many, but seems Samsung phones from South America lock to those networks if used for more than 5 minutes. Peruse this thread for some gory details: https://community.giffgaff.com/t5/Help-Support/samsung-J7-SIM-network-PIN-blocked-enter-network-PUK/...
>>> ALERT: I am not a CSA. Je ne suis pas un Agent du soutien à la clientèle.
