I´m willing to make a service available to GSM network users, where they can submit information (e.g. emergency contacts, etc.) with their mobile phones by SMS or via an USSD menu and when needed this same information can request from an USSD menu from their phone only (IMSI associated).
Most people have screen lock enabled on their phone/Smartphone/tablet with a PIN/Pattern, etc. and it becomes a problem for using an USSD menu for retrieving the information (e.g. family emergency contacts).
Is there a way I can have users accessing this information from a screen locked phone? They are Apps that allow to be accessed on a phone with a locked screen. We would love to use USSD menu to be able to support a wider range of devices. Other alternatives than USSD can be considered but budget is 0.
Please share your inputs.