New iPhone 11

It's the simplest way to transfer your phone number to your new phone and have it work. If you don't, you'll need to contact your cellular provider to have them activate the sim card in the phone to your telephone number.

You're welcome.

Have you set up the new phone from the backup of your previous phone?

See this link for directions --> Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support