why i have not sim ejector in iphone X box

Many unlocked iPhones come with SIM tools. If your iPhone was bought at a carrier store or on contract, EIP, etc you probably don't have a SIM tool. This is a nice way of your carrier saying the phone is locked to our network.

Really it just means, "The SIM is already installed. You don't need to fiddle with it." Until very recently, all iPhones sold for Verizon were unlocked. But, no, they still didn't come with a SIM Tool.

If the phone was sold for a particular carrier, it won't have a SIM removal tool. Only the unlocked ones come with one.

Use a paperclip.