370 is the area code for Lithuania.  One post I found claims that calling the number will incur huge overseas calling fees much like some of the 9xx numbers of recent years.  I received a call from area code 370 but my caller id only registered 370-4, nothing else.

RC'VD 'WITHHELD #" ON MY CELL. PERSON OPTED NOT TO LEAVE A VOICE MAIL; INSTEAD SENT ME A TEXT TO CALL 370-455-8696. I'M NOT CALLING