Hi janeann
If you first get your grandfather's marriage certificate from the reference Stan gave, you will find out a bit more about him, his age, address & occupation, and his father's name and occupation.
The man mentioned by Kenny was born in the Newcastle area and died there, so that may not be him.  His birth registration reference is 
Dec 1898  Newcastle T    10b   89     PHILLIPSON  William James   
but if your grandfather lived in Sunderland it doesn't mean he was born there, if you find his father's name we can then find him in the census and find his birthplace from that. 
In the free 1911 census index there is a William Phillipson b.1896 living in Hartlepool with parents John Joseph and Mary Ellen, you would need to buy credits to see the full details 
In 1901 the family is living in Sunny Brow, near Auckland, Durham
RG13 Piece 4650 Folio 92 Page 1   
5, Bridge Street, Helmington Row, Sunnybrow, County Durham
PHILLIPSON
John J    head mar 31    Cokeyard Filler    Grahamsley Durham  
Mary E   wife   mar 29                            Sacriston Durham  
Margaret A   dau    10                              Crook Durham  
Francis        son      7                                 Sunnybrow  Durham  
William           "       5                                     "
David    brother  15 Brick Works Labourer  Crook Durham
This is the likely birth registration for this William:
Jun 1896   Auckland    10a   200   Phillipson    William   (Auckland registration district covers Sunny Brow)
The marriage cert would tell you if this is your family
Barbara 
