They just use the speaker or do video calls. We have seen this.
As far as I can remember (pulling on 10+ year old memories), cellphones did not have a speakerphone until the last decade or so, and only really started with smartphones. I had a normal cellphone until 2017, and I cannot ever remember any of them having that functionality. Perhaps they did in the later years, but I'm certain that the early period did not.
However, I will admit that this is the Umamusume universe, so perhaps speakerphones were integrated into all of the early cellphones? Although it would be interesting to see one of the horse girls use a brick cellphone (pre-2000) that was over a foot long. XD
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