My phone number is not associated with my apple device and my phone number is not shown on face time and i cant send imessage otherone

Hello shrawan256,

It looks like you joined the Apple Support Communities from an excellent starting point; Add or remove your phone number in Messages or FaceTime - Apple Support. Did you remove your phone number here? If so, is there another phone number associated here or just your Apple ID/email address?

This link will help you with any sending and receiving issues you may be experiencing with iMessage to your device: If you can't send or receive messages on your iPhone or iPad - Apple Support. There are steps there for

If you have issues with Messages after you set up a new device

If you see a red exclamation point

If you see a green message bubble

If you receive messages on one device but not the other

If you have issues with a group message

If you still need help after following the guidance on this page, you may want to reach out to Apple Support directly. You can reach out to them by clicking here: Get Support or over the phone by calling the number that is most local to your region: Contact Apple for support and service - Apple Support.

We hope this information helps you out.

Cheers!