In a video posted on TikTok, the fan is holding a Spurs shirt with his name on the back and asked for a picture with the forward.
However, once Son realised that she was about to hand him an iPhone, he apologised to her and said he wasn't allowed to take it.
As reported by the Daily Mail, the South Korean's deal with telecommunications giants Samsung means he can't hold the devices of the rival companies.
He partnered with them during the summer, with fans meant to take the selfies themselves if they have a phone from another company.
Such a scenario was displayed in the video, with Son soon grabbing hold of a Samsung phone rather than an Apple one.
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He was all smiles as he went to take the picture, with the fan in question finally getting what they wanted.
Given his status as South Korean football's biggest star, there is no surprise that a company like Samsung want to work with him.
Posts on his Instagram have shown him promoting the company since he signed a deal with them.
Back on the pitch, Son has continued to prove why he is such a crucial asset to Spurs.
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He has scored three goals across their opening five matches of the season, all of which came in the 5-2 win over Burnley.
Like many of his teammates, Son has shown improvement on last season under new manager Ange Postecoglou.
Should he continue to excel in a Spurs shirt, then many more fans will be hoping they can snap a selfie with Son in the future.