Is there no address listed?
1901 directory-
http://www.lennonwylie.co.uk/alphanames1901nopq.htmPhillips, John, artist and photographer, 143 Royal Avenue; res., 238 Duncairn Gardens
1907 directory-
http://www.lennonwylie.co.uk/alphanames1907nopq.htm (1910 same)
Phillips, Henry, photographer, 8 Queensland Street
Phillips, John, artist and photographer, 45 Donegall Place; res., 238 Duncairn Gardens
1918 directory-
Mrs. Phillips listed at 8 Queensland St. & no Philips listed 238 Duncairn Gardens
Probate of the Will with one Codicil of John Phillips late of 238 Duncairn Gardens Belfast Photographer who died 22 July 1912 granted at Belfast to Annie Phillips the Widow and Henry Phillips Photographer.Probate of the Will of the late Henry Phillips, 8 Queensland Street, Belfast, Photographers Assistant, who died 19 July 1915, granted at Belfast 25 June 1919 to Isabella Phillips, the widow. Effects: £211 18s 6d.And from the old Belfast photographers threads/links-
https://www.flickr.com/photos/37053660@N02/4353121489/in/set-72157623303002721Phillips, John *7 Donegall Street (1877) 79 Donegall Street (1880)(1884), City Chambers, Royal Avenue (1887), 143 Royal Avenue (1890) (1892) (1895) (1896) (1897) (1899) (1900) (1901)
Someone was asking and I have some professional photographs from Ireland. John Phillips. Royal Avenue. Belfast. Abernethy. Photographer by Royal Appoinment. 29 High St. Belfast. Also Rembrandt Studio. 53 Donegall Place Belfast and 63 Pitt St., Newry and Bango. Down. Also one with Copied Cabinet on it but no address, only a little icon of a crown and lions.
If you need help establishing the date of an old photo there are lots of Rootschat experts-
http://www.rootschat.com/forum/free-photo-restoration/