Uninstalling the app won't affect your main phone number or erase your 2nd Phone Number account, but it will limit some functionality. Here's a breakdown:
Your Main Phone Number Stays Put: Your regular phone number will keep working like usual, completely separate from the 2nd Phone Number app.
Your 2nd Phone Number Stays Active (but Inaccessible): Uninstalling the app doesn't deactivate your 2nd Phone Number or your account. They'll remain active until they expire or you cancel them. However, you won't be able to access them.
No More 2nd Phone Number Features: Without the app, you won't be able to make or receive calls and texts with your 2nd Phone Number, use voicemail, or access any other features offered by the 2nd Phone Number app.
Important Note:
If you want to completely remove your 2nd Phone Number and account, you can't do that by simply uninstalling the app. You'll need to log in to the app itself, go to settings, and choose "Delete My Account".
In short, uninstalling the app is like putting your 2nd Phone Number on hold. It's still there, but you can't use it until you reinstall the app.