How to Receive Text Messages on Two iPhone

How come my phone doesn’t have a list of devices to share with show up? And there’s no option at all like yours that says text message forwarding. I have both signed into same Apple ID and ICloud ?

Do you why after doing all the setup secondary phone will not send messages to non iPhone? I have all my apple devices works fine but my new phone send messages only to iPhone users and it show the primary phone.

Could someone add your phone number to there messages? To see your messages without you knowing it? Like from a galaxy to there iPhone?

it only shares the messages l send and none that i receive

Does it have to be the same type of iPhone like if it’s a 15 does it have to be a 15??? or can it be any type of iPhone or iPad

So to do this both should be in same iCloud right ?

Can you make a phone call on the second iPhone?

If I delete a message on one phone, would it be deleted on the other phone?

very useful video thank you very much :)