No longer getting text messages on my iPad

Hello. I’m No longer getting text messages on my iPad When I go to settings, IMessages is turned on. But under send and receive it only shows my email addresses that are linked to my Apple account. It doesn’t give me the option to add my phone number, like it is on my iPhone. I just started having this problem about a week ago. until then whenever I would get a text message on my iPhone it would also go to my iPad. When I send a text from my iPad get successfully delivered but I’m not getting incoming messages there