Every mobile carrier handles eSIMs a little differently, but these are some of the most common situations users report after deleting an eSIM. "I deleted my eSIM before transferring to a new phone." Many users assume they can simply scan the same QR code again on their new device. Unfortunately, that's often not possible because many eSIM activation codes are valid for a single installation only. In these cases, the carrier must issue a new activation QR code.