A robust, reliable, downloadable OS for modern smart phones along the lines of "PureOS" https://pureos.net/ that the customer can easily download and install on their devices to replace the default service provider's proprietary Android, Apple iOS, or Microsoft operating system.

However, the new open OS will retain all the customer's personal files as well as retain all the pertinent information needed to connect to the service operator's network such as the phone number, phone model, model number, serial number, IMEI number, and IMEI (eSIM) number.