After traveling, I put my original SIM card back into my iPhone 16e and received a notice saying the phone was unregistered. I also noticed that the IMEI shown now is different from the one previously registered. During the trip, I used another SIM, and I still have a separate eSIM active. Can switching between physical SIMs and eSIMs cause the IMEI to change?
3 Answers
The active eSIM and physical SIM may be associated with different cellular identifiers, especially on a dual-SIM iPhone. Check the IMEI shown for each line and confirm that the number matches the device’s About screen and original packaging or purchase records. If none of them match, contact the carrier or Apple because an IMEI mismatch can indicate a registration or device-record problem.
An iPhone does not normally generate a new IMEI after travel or a SIM replacement. The most likely explanations are that you’re viewing IMEI2 instead of the original IMEI, or that the carrier has the wrong device attached to your account. Ask the carrier to verify the device registration while you provide the IMEI directly from Settings.
No, changing or removing a SIM card should not change the iPhone’s IMEI. If this is a dual-SIM model, check whether you’re comparing the primary IMEI with IMEI2—the phone can display a different identifier depending on which cellular line is active. You can find both under Settings > General > About.
Using a temporary travel SIM and then reinstalling the original one could explain why the carrier is asking for registration again, but it still would not rewrite the phone’s IMEI.