Can you send a short message to a cell phone in an area? Without knowing the other party's mobile phone number.

Yes, but it is usually illegal to do so. There is a kind of "pseudo base station", which can interfere with the normal work of the mobile phone base station, so that all mobile phones within its signal range can connect to it, get the number and IMEI of the mobile phone, and send short messages to the mobile phones within its signal range with any number. However, the "pseudo base station" is only valid for GSM mobile phones, but not for 3G mobile phones.

Hope to adopt