Depending on the field, the corresponding keyboard opens up to users

When users need to enter some data, the corresponding keyboard is shown up to them. E.x. when users need to enter a phone number, digits appear; when users must enter their email, the keyboard with @ sign opens up.

Check the example:

Here’s also the instruction on how to set up a numeric keyboard for IOS: https://nativescript.org/blog/nativescript-ios-numeric-keyboard/