This article covers Starway ポケットwifi 契約不要 モバイルwifi 国内150GB 365日間付き.

Overview

The Starway Pocket WiFi ST1 is a no-contract mobile router that gives you 150GB of data valid for 365 days with just a one-time device purchase. There are no monthly fees or cancellation procedures — it's a prepaid, buy-and-use solution. It uses cloud SIM technology to automatically switch between Japan's three major carriers (Docomo, au, SoftBank), so you don't need to insert a physical SIM card. Just power on and connect. It also works in over 150 countries, making it a great travel companion.

Connectivity & Compatibility

The ST1 features a cloud SIM (no physical SIM required) and supports Japan's three major networks with automatic carrier selection based on your location. It operates on 4G LTE with typical download speeds up to 150Mbps (depending on conditions). For overseas use, you purchase a data plan via the "Star Data" app before your trip; once you arrive, simply power on the device and it connects without roaming fees or identity verification. The built-in Wi-Fi supports dual-band (2.4GHz/5GHz) and can connect up to 10 devices simultaneously. It charges via USB, making it convenient for in-car use.

Product Info

The Starway ST1 is a relatively new mobile router that launched around 2025. It sits in the entry-level segment, with the key selling point being its contract-free, device-purchase model. Unlike conventional mobile routers that require monthly contracts, you pay once and use it immediately. The price on is ¥12,599 (tax included). It comes with a 1-year warranty and Japanese-language support (weekdays 10:00–19:00). The package includes the router, a USB charging cable, and a manual. When the data runs out, you can top up via the app. The data is valid for 365 days from activation, and remaining balance can be checked in the app.

Best Use Cases

Temporary internet needs: Ideal for short-term situations like moving, hospitalization, or business trips. No contract means you can just store the device after use. However, if you need consistently high data volumes, 150GB may be insufficient. International travelers: Works in 150+ countries, replacing the need to rent a pocket Wi-Fi. Just buy a local plan via the app before departure. Note that heavy daily usage during long trips may require additional top-ups, increasing cost. * In-car Wi-Fi: Powered via USB, it's perfect for constant connectivity in vehicles — for navigation, tablets in the back seat, or smartphones. Frequent video streaming will consume data quickly, so monitor your usage.

Product Disclosure (Amazon)

  • Manufacturer: Starway
  • Seller: 【StarwayチャージWiFi公式】
  • Fulfilled by: Amazon
  • ASIN: B0FGD79Q3P
  • Note: This article covers a manufacturer-made product based on Amazon listing details.