That plus any place you can pick up cheap/odd handsets (https://dx.com, https://www.aliexpress.com, are both good for some weird shit) should give him any number of options, including tiny ones that sit in your ear and phones the size of a small stack of credit cards.
Or just small 'feature phones' and Android handsets with 3.5/4" screens, which are definitely pocketable.
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That plus any place you can pick up cheap/odd handsets (https://dx.com, https://www.aliexpress.com, are both good for some weird shit) should give him any number of options, including tiny ones that sit in your ear and phones the size of a small stack of credit cards.
Or just small 'feature phones' and Android handsets with 3.5/4" screens, which are definitely pocketable.