How can I use the inputted Phone Number to the other Screens?

~For Context~

I'm developing an app for our thesis in where it should send the status of the device and battery status via SMS by using a GSM Module. (From GSM to Notification in app)


What I would like to know is do I need some sort of extensions or do I need to use some sort of database in order to get the inputted phone number from the other page?


Example Phone Number

Next Screen but still using the same number as the last screen to use by the buttons

Any suggestions and help will be much appreciated!

Calling new screen with parameter.

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Do you have to use multiple screens? If not, don't. Use virtual screens.

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