I bought a (sim lock free) S9+ in the Netherlands and read threads about region locks before bringing it with me to Colombia. I made two 6-minute phone calls while in the Netherlands, using a sim card from a Dutch provider. Theoretically, this should have removed the region lock, correct? However, once I put in my Colombian sim card it did not accept the code, which I had entered a number of times. Now I have the message "SIM network PIN blocked. Enter SIM network PUK". Is this because the region lock was never removed? Should the calls have been longer than 6 minutes? I am in Colombia now: how can I remove the region lock ? Would it work to use a European sim card and receive a call from Europe? Or how do I get the requested sim network PUK? Or an NCK or MCK code? FYI, my Colombian sim card itself is not blocked because it still works in my old S6. Please help! Thanks in advance.