If your secondhand iPhone’s network screen shows “Phone not allowed,” it likely means the device is locked to a specific carrier due to the previous owner's unpaid bills. This restriction can vary by region; for instance, the phone might connect to networks in South America but remain locked in North America. Unfortunately, Apple cannot unlock these devices, so it’s best to contact the previous owner to resolve any outstanding credit issues. If you still encounter this error after purchasing a Superhero eSIM, please reach out to our Support team for a refund.