Has anyone seen (something)?

If you're trying to find something, you can ask a group of people about it like this:

Has anyone seen a blue jacket anywhere?

Has anyone seen Samantha? Dennis wants to speak with her.

Use this phrase when you're speaking to three or more people. If you want to ask two people, you can say:

Have either of you seen my wallet?

(someone's) cell phone

"Cell phone" is another name for a mobile phone. This phrase is a little old-fashioned. These days, most people just use the word "phone".

Hey, where's my phone?

leave (something) (somewhere)

When you "leave" something in a place, it means that you put it there and then go somewhere else.

I think I left my scarf on the back of my chair at the restaurant.

You can "leave" something accidentally, or you can "leave" something on purpose.

Where is it? did you leave it somewhere?

I left some candy for you on your desk.

(something) is lying (somewhere)

When an object that's kind of flat is on top of something else that's flat, you can say that the object is "lying" there.

I saw that the remote control was lying on the floor underneath the sofa, so I bent over to pick it up.

A: Where's my shirt? Have you seen it?

B: Yeah. It's lying on the bed.

(something) is around here somewhere

When someone is looking for something, and you think it's nearby, you can say that it's "around here somewhere":

A: Where are they? I saw them earlier today.

B: Yeah, I think they're around here somewhere.