Facetime availability to the other persons

Hi abdallah1995

welcome to the Apple (user-to-user) Community.

Re: "i face an issue that my facetime does not show up for my friends"

You might want to ask your friends to add your name and details to their "contacts" app:

On your own iPhone:

There may be a setting that only allows your known contacts to contact.

You could check that your friends are listed in your "Contacts" app:

Add and use contact information on iPhone – Apple Support

You can also add a Contact card for yourself:

Add your contact info on iPhone – Apple Support

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Also: For FaceTime:

Apple Support's article: Make and receive calls

says:

"You must set up FaceTime before you can make and receive calls"

For friends with an Android device: you can:

Create a link to a FaceTime call on iPhone – Apple Support

You can also check if you have blocked anyone from calling:

Block unwanted callers in FaceTime on iPhone – Apple Support

All the best :-)