Premise: "A man on a sidewalk talking on his mobile phone."
Hypothesis: "A man is on the phone."
Do we know that the hypothesis entailed by the premise? Stream of thoughts:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Talking on his mobile phone means the man is on the phone.
Therefore, the answer is yes.