Check network usage restrictions (blacklist status) for free. Bulk check up to 20 IMEIs at once.
Each IMEI must be 15 digits
Select carriers to check. All carriers are selected by default.
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処理状況
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RE:FON is a B2B platform for smartphone and tablet trading
* Registration requires approval. Business scale and transaction continuity are considered.
Important Notice
This service provides reference information based on publicly available carrier data. We do not guarantee the accuracy, currency of results, or continued availability of this service. Please verify with official carrier websites for final confirmation.
RE:FON Smart Device B2B Platform
For Businesses Only (Approval Required)
Post device buy/sell requests and find the best trading partners.
Frequently Asked Questions
Is this IMEI checker free?
Yes, it's completely free to use. No registration required. You can bulk check up to 20 IMEIs. Supports all 4 major carriers: docomo, au, SoftBank, and Rakuten Mobile.
How many IMEIs can I check at once?
You can check up to 20 IMEIs at once for free. Separate multiple IMEIs with line breaks, commas, or spaces.
What is IMEI?
IMEI (International Mobile Equipment Identity) is a unique 15-digit number used to identify mobile phone devices. You can find it in your device settings or by dialing *#06# on your phone app.
Where can I check my IMEI?
There are 3 ways to check your IMEI: ① Dial *#06# in the phone app, ② Go to Settings → Device Information or About Phone, ③ Check the sticker on the device box or back of the device. The easiest method is dialing *#06#.
What are network restrictions?
Network restrictions are a system used by carriers to limit device communication capabilities. When device payments are overdue or the device is reported stolen/lost, it becomes "×" (blacklisted) and cannot be used for communication.
What do the check result symbols mean?
○: No restrictions (clean), △: Possible restrictions (e.g., installment payments pending), ×: Restricted (blacklisted), －: Unable to determine or not applicable, Error: Check failed (timeout or carrier-side error)
What is a blacklisted phone? What's the difference from a clean phone?
A blacklisted phone (×) has network restrictions and cannot be used for communication, making it almost unusable. A clean phone (○) has no restrictions and can be used safely. When buying a used smartphone, always ensure it's clean (○ status).
What should I check before buying a used smartphone?
Before buying a used smartphone, always check: ① IMEI network restrictions (○ status is ideal), ② Battery health condition, ③ Screen and body damage, ④ Functionality (camera, touchscreen, buttons, etc.), ⑤ Activation lock removal (for iPhone). IMEI checking is especially essential.
Is it safe to buy a phone with △ judgment (installment payments)?
△ judgment means "installment payments pending." It may change to ○ after full payment, but there's a risk it becomes × (blacklisted) if payments are missed. We recommend buying ○ status devices instead. If you must buy △ status, purchase from a trusted seller with blacklist protection.
What should I do if the IMEI check shows ×?
If the check shows × (blacklisted), the device cannot use network functions. Avoid purchasing if checking before buying. If already purchased, request a refund from the seller. For marketplace purchases (e.g., eBay, Mercari), contact platform support.
How reliable are the results?
This service provides reference information based on publicly available carrier data. Please verify with official websites (Docomo, au, SoftBank, Rakuten Mobile) for final confirmation.
What if results are slow to appear?
Processing takes longer when checking many IMEIs or multiple carriers. For faster results, select only the carriers you need. Results are cached, so subsequent checks will be much faster.