Is my cellphone was just here now its gone an declaritive interrogive imperative or exclamatory sentence?

The sentence "My cellphone was just here now it's gone" is a declarative sentence.

Here's why:

* Declarative sentences make a statement. They state a fact or an opinion.

* Interrogative sentences ask a question.

* Imperative sentences give a command or make a request.

* Exclamatory sentences express strong emotion.

The sentence you provided simply states a fact: the speaker's cellphone was recently present but is now missing.