I got a new Koodo LG G5 to replace my LG G3 three weeks ago. The new G5 cannot be unlocked for 90 days. Therefore, the Koodo rep told me to use my G3 in Croatia to insert a SIM card and get service. My G3 was already unlocked from a trip to the UK in 2015. However, when I arrived in Zagreb and inserted the SIM card it requires an unlock PIN. I cannot find an unlock PIN. Help! How do I unlock my phone to access the network?