IMEI 1 and IMEI 2: Why my phone has two IMEI numbers?

imei slotAs the phone is a European version and has the certificate of EU, besides Anatel(I am based in Brazil), consequently IMEI slots are locked toI see two IMEI numbers on my phone; do I need to provide both for exchange? No, you need to enter only one of them into the IMEI number field.