Hi there PaulBony,
You'll want to start by making sure you have both phone numbers selected to use with iMessage and FaceTime in your cellular settings:
Set your default number
Choose a number to use when you call or send a message to someone who isn't in your Contacts app. Choose which cellular plans you want to use for iMessage and FaceTime. You can choose either or both numbers.
On this screen, choose a number to be your default, or you can choose which number is to be used only for cellular data. Your other number will be your default. If you want your iPhone to use cellular data from both plans, depending on coverage and availability, turn on Allow Cellular Data Switching.
Learn more about how that works here: Using Dual SIM with an eSIM - Apple Support
Ultimately, if you need further assistance with this, you'll want to reach out to your wireless carrier directly. They're best-equipped to provide some additional guidance.
Take care!