Tae Kim Complete Guide: If (you) don’t know (the) phone number, (you) can’t contact (him/her/them), right?
(Expressing almost 100% certainty)

Question

If (you) don’t know (the) phone number, (you) can’t contact (him/her/them), right?
(Expressing almost 100% certainty)

アリヤン · Accepted Answer

電話番号が分からないと連絡が出来ないでしょう？

How do you say If (you) don’t know (the) phone number, (you) can’t contact (him/her/them), right? (Expressing almost 100% certainty) in Japanese?