My phone has been stolen and it is missing and I want to disable it or break it

Here is what to do: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

The serial number and IMEI are not useful here, as allowing users to perform remote disablement, or allowing remote tracking, with only the serial number or IMEI, would be widely abused.

Ahmedalgdz wrote:

But how do I remotely wipe the phone knowing that the phone is not connected to the internet

You follow the steps outlined.

The data will be protected by the passcode, pending any potential reconnection.

If there is no reconnection, then there can be no remote wipe.