Reports say that MH370's last ACARS pings were received by Inmarsat.
If it's a fact that the pings were received by Inmarsat only, and not by ACARS ground stations, couldn't you deduce that MH370 was not in range of an ACARS ground station when it sent its last pings?
SITA ACARS ground station coverage:
ARINC ACARS ground station coverage:
SITA ACARS ground station coverage (PDF)
ARINC ACARS ground station coverage (PDF)