Apparently they came to the US between 1839-1843 after Elizabeth (2)
and before Cryus was born. Closest match we have so far is
the NY harbor log for the Ship Empire arriving 9/17/1839
with everyone over the age of 10 accounted for.

Mary born 4/12/1825
Sarah born 10/15/1827
William Bethram Phillips born 9/3/1829  
Richard Phillips born 12/7/1831 later moved to Dodge, Texas
Thomas Phillips 12/13/1837
Elizabeth born 5/12/1839 Shrewsbury, (Shrophire County)England
Cyrus Phillips 5/12/1843 (possiblity) Huron Ohio

William's V's brother Richard is believed to have mirgrated to Australia
about the same time period.