According to their Hebrew web site, the phone number of the old Jewish cemetery in Jaffa is +972-3-7953600.
When calling, there is an option to be directed to an English speaker.
Hope this helps.
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Steve Goldberg
Jerusalem, Israel
Researching:
Sagan/Shagan family from Veliuona (Velon), Lithuania
Goldberg family from Vidukle, Lithuania
Susselovitch/Zuselovitch family from Raseiniai (Rassein), Lithuania