I have the Sprint iPhone SE (Model A1723), and I first requested an unlock with Customer Care over the phone and she said she processed it and it could take about 3 days. I than went on International chat and this was like hours later after my phone call and I asked on chat to check the unlock status request. It sounds like over the phone they did not process because the chat was processing it. They told me to complete the SIM unlock, I would need to backup, reset, and restore. Well, I just restored with iTunes, but first I took out the SIM and instead of an unlock message and I get no SIM card message and to disconnect my iPhone from iTunes and insert the SIM. Could it be I need to have the Sprint SIM inserted to complete the unlock request? I confirmed with chat if they was processing for both Domestic and International use and they said yes. I do not have any SIMs for another company to test.