Both Namba and Umeda have dedicated prepaid SIM shops geared toward foreign travelers, typically with English-speaking staff and same-day activation.
Namba SIM shops
Shops cluster near the main station exits in Namba, making them easy to find on foot without much searching.
Umeda SIM shops
Umeda options are mostly located inside or near the major department stores connected to the station, similarly convenient if you are already in the area.
Tip: Bring your passport: Japanese regulations require ID to register a prepaid SIM, and shops will not complete the sale without it.
Choosing between the two
Pricing is generally similar between Namba and Umeda, so proximity to where you are staying is usually the deciding factor.
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