Did you recived a missed call or text from 2034899837? Check on the feedback below to know more about the caller identity. Make sure to leave your own feedback if possible to help protect other people from scammer, prankster, telemarketer etc.
On Android go to the number in a phone book or in a call list, tap the Menu key ☰ and select "Add to block list" or "Block contact" option (depending on the manufacturer).
On your iPhone go to a dial list or Phone app, then select the number and tap "Block contact" in the bottom.