For reuse and recycling businesses, used smartphone procurement is a core operation. At the same time, there are several pitfalls to watch for—especially **network usage restrictions** (often called “Red ROM” in Japan).
What is a network usage restriction?
In Japan, many phones are purchased via installments. If the buyer falls behind on device payments, carriers such as NTT DOCOMO or au can restrict the device from connecting to the carrier network. Devices under restriction may be unable to place calls or use mobile data, making them difficult to resell. In some cases, a device can later become restricted after purchase, forcing a retailer to refund or compensate the customer.
Key checks when sourcing used smartphones
When buying used devices, make sure you check at least the following:
– Network restriction status: Use the device’s IMEI to check the carrier’s website. Status is typically shown as “○ / △ / ×”.
– “○”: no restriction
– “△”: potentially at risk (requires extra confirmation)
– “×”: restricted (Red ROM)
– Seller reliability: Prefer sellers with a track record, clear return policy, and strong guarantees.
– Device condition: Inspect exterior, display, battery health, buttons, and run basic functional tests when possible.
– Other basics: SIM lock status, included accessories, whether the device has been wiped/reset, and theft checks where applicable.
Prevent procurement issues with MASAMUNE Erasure
MASAMUNE Erasure includes a Network Restriction Checker. It helps you quickly confirm network restriction status before purchase and significantly reduces the risk of accidentally sourcing restricted devices.
By combining proper restriction checks, seller screening, device inspection, and reliable data erasure, you can build a safer and more stable procurement workflow.
