Mrs. Coulter was not sure if she heard right, and then she recognized it before she could ask the other woman to repeat it. A "Phone" shop, those little communication devices being used in the City.
(She happily pushed aside the need to communicate in a different language.)
"There is a nearby store, which I will be going to after I finish my business. I can show you."
Her 'business' was opening her hand purse, pulling out a non-descript string sack, and putting it down on the counter for the pawnbroker to unravel and ogle over. Mrs. Coulter received a hefty sum, which she kept promptly in her purse.
With that done, Mrs. Coulter faced Atsuko, "Come along." She offered her elbow to her monkey companion who took on the invitation and leapt on it, its black hands upon her shoulder.